OPINION OF THE COURT
Per Curiam.Respondent was admitted to the practice of law in the State of New York by the Third Judicial Department on April 15, 1997, and at all times relevant to this matter has maintained an office for the practice of law within the First Judicial Department.
Although admitted in 1997, respondent did not begin to practice law until October 2003, when he became an associate at the Furman Law Firm, which concentrated in postconviction motion practice in criminal matters. The principal of the Fur-man Law Firm was Daniel Furman, who employed as an associate, in addition to respondent, Antoinette Wooten, an attorney admitted only in New Jersey. Upon Mr. Furman’s death in March 2004, respondent became the attorney for his estate, and formed his own law firm, variously named the New Furman Law Firm, Furman Law Offices, or Furman Law Firm, consisting only of himself.
In June 2008, the Departmental Disciplinary Committee (Committee) served respondent with a notice of 19 disciplinary charges against him, to which a 20th charge was added by prehearing stipulation. The charges against respondent relate to his dealings with 13 clients of the Furman Law Firm and their cases after Mr. Furman’s death. The charges involve allegations that respondent made misrepresentations to a Federal Magistrate Judge and the Committee, disregarded a court order, neglected legal matters, undertook legal matters he was not competent to handle, interacted with clients and colleagues in an abusive manner, charged excessive fees, charged nonrefundable retainers, disseminated deceptive advertising, and failed to keep records, in violation of 10 Disciplinary Rules: Code of Professional Responsibility DR 1-102 (a) (4), (5) and (7), DR 2-101 (a), DR 2-106, DR 2-110 (a) (3), DR 6-101 (a) (1) and (3), *41DR 7-101 (a) and DR 7-106 (a) (22 NYCRR 1200.3, 1200.6, 1200.11, 1200.15, 1200.30, 1200.32, 1200.37).
The Referee, after receiving evidence, sustained 9 of the 20 charges, and recommended a sanction of public censure. The Hearing Panel disagreed to the extent of sustaining 19 charges and recommending a sanction of an 18-month suspension. The Committee now moves to confirm the Hearing Panel’s findings of misconduct and its recommendation that an 18-month suspension be imposed. Respondent cross-moves to confirm the Referee’s report and his recommendation that respondent be publicly censured; in the event that this Court sustains any or all of the charges the Referee dismissed, respondent requests a three-month suspension.
The 19 charges sustained by the Hearing Panel (the Committee no longer pursues charge 17) may be summarized as follows:
The Baron Erby Matter (charges 1-5)
Charge 1 alleges that, by failing to file a reply to the People’s opposition to Erby ‘s federal habeas corpus petition, and belatedly filing a motion to hold the petition in abeyance, when he had been specifically retained on the petition, respondent failed to seek the lawful objectives of the client (DR 7-101 [a]).
Charge 2 alleges that respondent’s failure to advise the Magistrate presiding over the Erby matter of his change of address caused delay while the court tried to locate him, which was prejudicial to the administration of justice (DR 1-102 [a] [5]).
Charge 3 alleges that respondent’s statement to the Magistrate that Erby had not retained him was false (DR 1-102 [a] [4]).
Charge 4 alleges that, by representing Erby on the habeas petition when he knew he was not competent to handle it without associating with an experienced attorney, respondent violated DR 6-101 (a) (1).
Charge 5 alleges that respondent’s overall handling of the Erby matter adversely reflects on his fitness to practice law (DR 1-102 [a] [7]).
The Nancy Schmelzer Powers Matter (charges 6-8)
Charge 6 alleges that, by failing to file a response to the People’s answer to Powers’s federal habeas corpus petition, respondent neglected a legal matter (DR 6-101 [a] [3]).
Charge 7 alleges that, by failing to inform the United States District Court for the Western District of New York of his admission status in that district, as directed, he disregarded a ruling of a tribunal (DR 7-106 [a]).
*42Charge 8 alleges that respondent’s statements to the Committee that he never committed to representing Powers and that he did not have her file were false (DR 1-102 [a] [4]).
The Lentworth A. Brown Matter (charge 9)
Charge 9 alleges that respondent’s telling Brown that he did not know who he was and had nothing to do with his case, after filing a brief on his behalf and inviting Brown to retain him after Furman’s death, adversely reflected on his fitness to practice law (DR 1-102 [a] [7]).
The Moses James Matter (charges 10-12)
Charge 10 alleges that, by failing to complete his representation of James, respondent neglected a legal matter (DR 6-101 [a] [3]).
Charge 11 alleges that respondent’s letter to James insisting that he had nothing to do with his case adversely reflects on his fitness to practice law (DR 1-102 [a] [7]).
Charge 12 alleges that respondent’s failure to retain any documentary evidence that he had returned James’s file, as he had committed to do, also adversely reflected on his fitness to practice law (DR 1-102 [a] [7]).
The Edward Guzman, Veronica Sullivan, Luis Burgos-Santos, and Susano Pagan Matters (charge 13)
Charge 13 alleges that respondent’s failure to account for the disposition of the files of the above-listed clients adversely reflects on his fitness to practice law (DR 1-102 [a] [7]).
The Terrance Scott, Daniel McQueen, Javier Pacheco, and Marcus Telesford Matters (charges 14-16)
Charge 14 alleges that respondent charged Scott an excessive fee, in violation of DR 2-106 (b), by charging $7,575 over and above the $4,500 retainer already paid, and by failing to maintain any time records to justify the fee.
Charge 15 alleges that respondent’s denial to the Committee that he represented Scott was false (DR 1-102 [a] [4]).
Charge 16 alleges that the nonrefundable retainer agreements with Scott, McQueen, Pacheco, and Telesford adversely reflected on respondent’s fitness to practice law (DR 1-102 [a] [7]) and contravened DR 2-110 (a) (3), which requires the return of unearned fees.
Advertising (charge 18)
Charge 18 alleges that respondent violated DR 1-102 (a) (4) (prohibiting “conduct involving dishonesty, fraud, deceit, or *43misrepresentation”) by engaging in false advertising. Specifically, he promulgated — only six months after he started practicing law, and one month after he started a solo practice — a form letter making the following statements:
“My team of attorneys has hundreds of years of combined experience .... My team is made up of trial lawyers and includes former prosecutors. Over the years we have worked on every type of criminal and civil case you can imagine. We know every trick in the book that was used to convict you.”
In addition, from 2005 to May 2006, respondent maintained a Web site on which he claimed to be an “expert” in state and federal postconviction motions who had “handled at least one hundred criminal cases,” and asserted that “[flew attorneys have spent as much time in the courtrooms of this city” as he had.
Totality of Conduct (charge 19)
Charge 19 alleges that all of the other charges evinced a pat- . tern of conduct that adversely reflects on respondent’s fitness to practice law (DR 1-102 [a] [7]).
The Jose Vaello Matter (charge 20)
Charge 20 concerns respondent’s communications with assigned appellate counsel for Vaello, whom respondent and Wooten (respondent’s associate at the Furman Law Firm) had represented at the trial that resulted in Vaello’s conviction for rape and other crimes. After Vaello’s conviction, his appellate counsel (Claudia Trupp and Robert Dean of the Center for Appellate Litigation) moved to vacate the judgment on the ground that respondent and Wooten had rendered ineffective assistance of counsel at trial; the motion was ultimately granted. The charge alleges that respondent’s letters and messages directed to Trupp and Dean, protesting their claim that he had rendered Vaello ineffective assistance of counsel at trial, adversely reflect on his fitness to practice law (DR 1-102 [a] [7]).1
*44By prehearing stipulation, respondent conceded the material facts underlying the charges, but contested liability, arguing that he had not acted with the intent required to render his conduct violative of the disciplinary rules. On the Committee’s motion to confirm, respondent concedes liability on the nine charges sustained by the Referee (charges 1, 4, 6, ,7, 11, 14, 16, 18 and 20), and contests liability on the 10 charges rejected by the Referee but sustained by the Hearing Panel (charges 2, 3, 5, 8, 9, 10, 12, 13, 15 and 19). We confirm the Hearing Panel’s finding of liability against respondent on each of these remaining contested charges.
Respondent contends that charge 2 should be dismissed because his failure to notify the Magistrate of his change of address was inadvertent, and therefore was not prejudicial to the administration of justice (DR 1-102 [a] [5]). Intent is not an element of that Disciplinary Rule, although it may be considered in mitigation of a sanction (see Matter of Berger, 1 AD3d 83 [2003]), and the failure to notify a court of a change of address is prejudicial to the administration of justice (cf. Matter of Fletcher, 58 AD3d 254 [2008] [failure to inform OCA of address change within 30 days, pursuant to Judiciary Law § 468-a, is prejudicial to administration of justice]). Moreover, respondent’s failure to update his address caused delays in the case and wasted judicial resources as the court tried to locate him.
Respondent argues that the Panel should have deferred to the Referee’s credibility determinations that he did not intentionally mislead anyone regarding his professional obligations to Erby, Powers, or Scott (charges 3, 8 and 15, respectively; DR 1-102 [a] [4]). According to respondent, he subjectively believed, when queried by the Magistrate, that Erby had hired the Fur-man Law Firm (primarily to pursue state remedies) and he agreed only to help out on a pro bono basis. The Panel properly drew the opposite inference from the documentary evidence. 2 With respect to Powers, respondent filed her habeas petition *45and asked the court to serve him with any response. He told Powers that he had spent 10 days working on that matter. His statement to Powers that he “had to use the Party in Interest format” because he “could find no one willing to act as local counsel,” could support the interpretation that he used that “format” because of the geographical distance or because he was not admitted in that jurisdiction. Having, by his own admission, worked on Powers’s state filings as attorney of record and at least in an advisory capacity on her federal application, respondent cannot truthfully blame his failure to return her files on Furman’s filing system; in fact, he contradictorily states that all client files were returned. As to Scott, respondent’s charging Scott an initial retainer fee, writing regarding the case, and billing for additional legal research after he was terminated belies his claim that he never represented Scott and communicated with him only briefly “as probate counsel” for Furman’s estate.
Accordingly, the evidence supports the Panel’s determinations regarding charges 3, 8 and 15, based on DR 1-102 (a) (4). Furthermore, the Panel was not confined to the “cold record,” as respondent asserts, but had an opportunity to assess his credibility when he appeared before the Panel for a hearing.
In dismissing charge 5 (alleging that respondent’s handling of the Erby matter adversely reflects on his fitness to practice law), the Referee stated that the shortcomings of respondent’s performance in that matter reflected inexperience, as opposed to incompetence, and therefore did not adversely reflect on his fitness to practice law (DR 1-102 [a] [7]). Although inexperience alone is not objectionable, taking on a matter one is not capable of handling is a disciplinary infraction, as respondent concedes. Moreover, charge 5 was not premised on alleged incompetence, but on the totality of respondent’s misconduct in the Erby matter (failure to seek his client’s lawful objectives, accepting representation on a case he was not capable of handling, making a misrepresentation to the court, and failing to notify the court of his change of address). Accordingly, the Hearing Panel correctly sustained charge 5.
*46Charge 9 arose from respondent’s sending Brown a letter addressed to “all clients of the Daniel C. Furman Law Firm,” stating that respondent was merely “the probate attorney for the Estate of Daniel C. Furman” and, as such, had nothing to do with the recipients’ cases and did not know who they were. Respondent sent this form letter to Brown notwithstanding that respondent had filed a brief with the Second Department on Brown’s behalf, had corresponded with him about the case, and had received from Brown an executed representation agreement. Even if respondent’s sending the form letter was the result of poor office management, as the Referee concluded, running an office in a disorganized manner adversely reflects on a lawyer’s fitness to practice in violation of DR 1-102 (a) (7) (see Matter of Ioannou, 47 AD3d 65 [2007]). Moreover, the tone of the letter, stating that any client who wished to speak to respondent would have to make an appointment and pay for it, and those without an appointment would be ‘‘uninvited guest[s] and . . . handle[d] accordingly,” lacked civility and professionalism. Accordingly, the Panel properly sustained charge 9.
Contrary to the Referee’s implication, DR 1-102 (a) (7) (conduct adversely reflecting on fitness to practice law) does not require intent, and respondent’s failure to return client files to James, Guzman, Sullivan, Burgos-Santos, and Pagan, and to account for the disposition of any other file, adversely reflected on his fitness to practice law, even if the conduct was the result of his poor office management skills (see Ioannou, 47 AD3d 65). Accordingly, the Panel properly sustained charges 12 and 13.
With regard to charge 10, although respondent sent the relatives of Moses James a letter stating that he was working on the case and would inform James of an attack plan within six weeks, eight weeks later respondent sent James a letter advising that the Furman Law Firm had ceased to exist, that James was now unrepresented, and that respondent would return the client’s file. When James inquired, respondent sent him the same form letter discussed in connection with charge 9, stating that respondent was merely a probate attorney, did not know who James was, and had no involvement in his case. Those communications support the Panel’s inference that respondent neglected the client matter (charge 10, DR 6-101 [a] [3]).
Finally, the totality of respondent’s conduct, involving multiple clients, several acts of dishonesty, and continuous incivility towards clients and other attorneys, adversely reflects on his fitness to practice law (DR 1-102 [a] [7]),. and therefore the Panel properly sustained charge 19.
*47With respect to sanction, respondent maintains that he should not be held accountable for “unjust and unsupportable claims by inmates who would allege anything.” He asserts that he was merely an inexperienced attorney who “did the best he could” in attempting to clean up the mess allegedly left by Furman, “who was dishonest and incompetent.” Respondent claims that he now keeps time sheets of his activities and a “very careful filing system.” He says that he only takes on simple cases and refers matters he does not feel capable of handling. He represents that he now realizes that once he appears in a case he is responsible for every aspect, and promises to refund any unearned fees. In addition, he asserts that he is trying to deal with his anger-management problem, and, henceforth, will always comport himself in a professional manner, no matter how much he is provoked. He recognizes that, rather than threatening Trupp and Dean in the Vaello matter (the basis of charge 20), it would have been preferable to file a disciplinary complaint if (as he believed) their claims of the ineffectiveness of his performance as trial counsel were unjustified (although their motion to vacate the conviction based on his ineffectiveness was ultimately granted). He submitted letters of support from three attorneys, none of whom claimed to know him well or to have substantial familiarity with his legal practice or professional reputation.
The Hearing Panel noted that respondent’s character witnesses had no knowledge of his professional career, and that no attorney confirmed his contention that he seeks advice from others in matters where he lacks experience. The Panel also noted that respondent failed to produce the time records he claimed to now keep. The Panel found respondent’s expression of remorse to be inadequate, in that he attempted to blame his conduct on his clients’ “ ‘creating a bad environment,’ ” and he failed to “appreciate the anguish that he caused the incarcerated prisoners and their families.” His demeanor at the hearing before the Panel did not denote sincere remorse, and the Panel credited him “at best ... for recognizing that he should have handle[d] things differently.” Under all the circumstances, including the multiple charges, “numerous inconsistencies” in respondent’s testimony, his “complete lack of professionalism,” his “dubious” expression of contrition and remorse, the Panel recommended a suspension of 18 months “to communicate to Respondent the seriousness of his conduct.” The Panel further “strongly recommend[ed]’’ that respondent seek professional *48help to control his anger, and that he be required to submit proof on that issue if he applies for readmission.
Like the Hearing Panel, we are not entirely persuaded by respondent’s claims of contrition and intention to change. His continued attempts to blame his clients and Furman, at least partially, for his own misconduct supports the Hearing Panel’s finding that he lacks sincere remorse or insight into his deficiencies. His lack of experience as a lawyer does not excuse his hostile language toward Trupp and Dean or his cavalier attitude regarding the maintenance and return of client files. Respondent’s claims of selfless pro bono work are undermined by his bills for fees and his assertion that his only obligation toward nonpaying clients was to file their court papers and mail their files. In light of his inability to substantiate that he returned client files, the Panel rightfully drew an adverse inference from his failure to submit proof that he now keeps time sheets and file records or attends some form of anger management therapy.
In considering the appropriate sanction for respondent’s misconduct, we also take cognizance of a pro se supplemental memorandum he has submitted to this Court (without his counsel’s knowledge) in opposition to the Committee’s motion and in support of his cross motion. In this submission, respondent admits to “making a few unintentional errors which were due to his inexperience,” but complains that the Committee has “conducted] an unrelenting witch-hunt in attempting to create misconduct where none exists and to exploit such fabricated misconduct by exacting a cruel punishment which would be inconsistent with the established facts and with all norms of discipline necessary to protect the public.” He accuses the Committee of “hypocrisy, betrayal of the public trust, double-standards, in showing preferential treatments to its cronies in its ‘old boy network’, while engaging in ethnic animus toward those who are of ethnic minorities or not well connected, and flagrant miscarriages of justice.” These inflammatory claims are not supported by respondent’s references to other disciplinary cases. Further, respondent’s bizarre, unsubstantiated arguments, as well as his call for the prosecution of the Committee staff attorney assigned to respondent’s case, belie his representations that he is addressing his manifest shortcomings in the area of anger-management and his promise to comport himself henceforth in a professional manner. In sum, respondent’s pro se *49supplemental memorandum highlights the need for the imposition of a serious disciplinary sanction.3
As a general rule, suspension is imposed on an attorney who fails to return the unearned portion of a fee and engages in other misconduct (see Matter of Corcoran, 243 AD2d 86, 88 [1998]). Similarly, suspension is generally the appropriate sanction for neglect coupled with additional misconduct (see Matter of Danas, 236 AD2d 44 [1997]). Under either of those general rules, respondent’s request for public censure should be rejected. The suspensions ordered in cases involving numerous instances of nonvenal misconduct approximating respondent’s range from 1 to 3 years. Although the Committee seeks only an 18-month suspension, we find — considering all of respondent’s misconduct, his continued attempts to place blame for his failings on his clients and his deceased former employer, his lack of sincere remorse, and his apparent failure to take effective corrective actions regarding his office operations and volatile temper — that a three-year suspension is the appropriate sanction in this case (see Matter of Moore, 197 AD2d 254 [1994] [neglect of eight legal matters, failure to satisfy a judgment to return client fees, failure to promptly return unearned fees, and attempt to dissuade clients from testifying before the Committee]; Matter of Sorote, 196 AD2d 339 [1994] [13 disciplinary violations, including neglect and failure to return an unearned fee]).
Accordingly, the Committee’s motion should be granted to the extent of confirming the Hearing Panel’s findings of fact and conclusions of law and sustaining charges 1-16 and 18-20 against respondent, and respondent is suspended from the practice of law for a period of three years, effective 30 days after the date hereof and until further order of this Court. Respondent’s cross motion is denied.
*50Tom, J.P., Andrias, Friedman, Nardelli and Richter, JJ., concur.
Respondent suspended from the practice of law in the State of New York for a period of three years, effective October 28, 2010 and until further order of this Court. Cross motion denied.
. The particulars of charge 20 are as follows. Upon reviewing Trapp’s affirmation in support of the motion to set aside Vaello’s conviction, respondent wrote her a letter stating that he intended to sue her for defamation and to report her to the Committee, concluding with the following warning: “I will further fully cooperate with the DA to destroy your stupid and deceitful argument about my representation of Mr. Vaello. In my humble opinion, you are truly not only an incompetent lawyer, but a liar as well. Further, you may very well have committed [perjury].” The following day, respondent left five voice messages on Trapp’s answering machine, telling her that she was in “deep *44trouble” because he would sue her for defamation and civil rights violations and report her to the Committee; he also stated that his father was a “wealthy man” who had “access to the very best lawyers in this town.” Respondent also sent a letter to, and left a voicemail message for, Trupp’s supervisor, Robert Dean, threatening him, Trapp, and the Center with “millions of dollars” of litigation, criminal proceedings, and disciplinary action, and accusing Dean of “stupidity and . . . lack of authority and supervision over [his] incompetent staff attorneys.”
. Among other things, the documentary evidence concerning Erby’s case establishes the following: (1) Erby’s wife paid a retainer after Furman died *45and specifically for “federal litigation 2254” (referring to 28 USC § 2254); (2) respondent personally wrote to Erby welcoming him to the firm and stating that once the “client intake forms” were fully executed he could “begin the investigative process, and [the] crafting of a collateral attack plan”; (3) respondent petitioned the court “to substitute him in place of [Erby], who [was] acting pro se”; and (4) Erby repeatedly wrote to respondent inquiring as to the status of his habeas petition and expressing his own belief that respondent had “tak[en] over as counsel.”
. After respondent filed his pro se supplemental memorandum, his counsel directed a letter to this Court, clarifying that counsel “did not draft, review or participate in [the] submission” of this document, of which counsel did not “learn[ ] . . . [until] after it was filed with the Court.” Counsel’s letter purports “to withdraw that submission and ask that it be returned, expunged or destroyed before it is accepted by the Court as a submission.” We decline this request, as the pro se submission is relevant to this proceeding in its adverse reflection on respondent’s current fitness to practice law, and in the light it casts on respondent’s need to learn to exercise greater self-control if he is to resume the practice of law.