Marc O. Sheridan, Partner


(914) 241-6300


(914) 241-6308

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Marc Sheridan, AttorneyMr. Sheridan has represented individuals, small businesses, and national and multi-national clients for over twenty years concerning employment discrimination claims, restrictive covenants, reduction in force issues, negotiation of severance agreements, and worker classification/overtime issues. He has litigated claims under the FLSA, FMLA, ADEA, ADA, Title VII, New York State Human Rights Law, New York City Administrative Code, and the New York Labor Law in state and federal trial and appellate courts.

Mr. Sheridan regularly appears in FINRA and AAA arbitrations on behalf of securities industry professionals regarding unpaid bonuses, promissory notes, and contractual disputes. Mr. Sheridan frequently writes, lectures, and is consulted on employment law developments, including proper hiring practices, sexual harassment prevention, managing employee performance, and attending to leave of absence issues related to disability, pregnancy, and other protected categories. Mr. Sheridan also trains human resources professionals and business groups and owners in the New York City metropolitan area on using dispute resolution techniques in the workplace. Mr. Sheridan has been quoted frequently on employment law developments including social media issues in the employment context by Bloomberg BNA’s Workforce Strategies and other publications.

Mr. Sheridan is Chair of the Westchester County Bar ADR Committee, a Board Member for Attorneys for Family-Held Enterprises (AFHE), and a member of the Family Firm Institute (FFI). He is also a member of the New York State Bar Association Dispute Resolution and the American Bar Association Dispute Resolution Sections.

Mr. Sheridan is a panel mediator for the International Institute of Conflict Prevention and Resolution (CPR), an employment discrimination mediator for the United States District Court for the Southern and Eastern Districts of New York, panel mediator for the Supreme Court, Westchester County Commercial Division and Civil Panels, and Westchester County and Bronx County Surrogate’s Court Panels. Mr. Sheridan co-authored the 9th Judicial District Presumptive Mediation Program Rules and the Westchester County Surrogate’s Court Presumptive Mediation Program.

In addition to his litigation and mediation practice, over the last decade, Mr. Sheridan has become a recognized leader in Civil Collaborative Practice. He is Co-Chair of the Trainers’ Group for the International Academy of Collaborative Professionals (IACP) and the Northeast Regional Director for the Global Collaborative Law Council (GCLC), and lectures and trains lawyers and other professionals on Civil Collaborative Practice domestically and internationally. Below is a sample of his past and upcoming lectures, webinars, and trainings on Civil Collaborative Practice:

In 2009, Mr. Sheridan was interviewed on CBS Internet radio on the benefits of Collaborative Law in the business and employment context. In October 2011, Mr. Sheridan lectured on utilizing ADR techniques in employment and business disputes for the New York State Bar Association, Dispute Resolution Section, and the IACP at its annual forum.

Mr. Sheridan is also founder of the New York Civil Collaborative Group, which in 2012 completed a CLE video webinar for lawyers through the International Institute of Conflict Prevention and Resolution on using Collaborative Law in employment disputes.

In May 2013, Mr. Sheridan was interviewed in Bloomberg BNA’s Human Resource Report and presented to the Dallas Bar Association’s Collaborative Law and Labor and Employment Law Sections on applying Collaborative Law to workplace disputes. In November 2013, Mr. Sheridan lectured on Collaborative Law to the New York City Bar Association.

In 2014, Mr. Sheridan lectured on the expansion of Collaborative Law to the Mid-Hudson Society for Human Resource Professionals, the Collaborative Law Association of Southern Pennsylvania, and the New York City Bar Association. He also addressed the New York State Dispute Resolution Association and the Global Collaborative Law Council in Dallas in October 2014 on the use of Collaborative Practice in Domestic and International Employment Disputes.

In June 2015, Mr. Sheridan conducted a two-day and three-day interdisciplinary Civil Collaborative training in Spanish at the Universidad Carlos III in Madrid and the Universidad International Menendez Pelayo in Santander to members of the Collaborative Law Association in Madrid and Euskadi. Mr. Sheridan spoke on the role of counsel as problem solver at the New York State Dispute Resolution Association 2015 annual meeting.

In 2016, Mr. Sheridan conducted a two-day Civil Collaborative training for the Collaborative Law Association of Southwestern Pennsylvania and addressed the European Collaborative Practice Conference in Amsterdam, Netherlands on building Collaborative Practice beyond divorce.

In 2017, Mr. Sheridan presented on Collaborative Practice for family businesses at the annual Attorneys for Family Held Enterprises conference in Miami, and returned to educate newly-minted lawyers on Collaborative Practice for the NYC Bar’s annual Bridge-the-Gap program.

In 2018, Mr. Sheridan conducted a two-day advanced training at the annual GCLC conference in Las Vegas, Nevada. In 2019, he presented to the Nassau and Suffolk County Bar Associations on Civil Collaborative Practice. In 2021, Mr. Sheridan will be conducting an advanced Civil Collaborative Practice training at the annual congress for ENCP.

Areas Of Practice

Securities Industry Employment Disputes
Employment Discrimination
Commercial Litigation
Collaborative Practice

Bar Admissions

New York
U.S. District Court Eastern District of New York
U.S. District Court Southern District of New York


Brooklyn Law School, Brooklyn, New York
J.D. - 1998
Union College, Schenectady, New York
B.A. - 1995
Honors: cum laude
Major: History and Spanish

Representative Cases

Kelly v. Evolution Markets, Inc., 626 F. Supp2d 364 (S.D.N.Y. 2009), Enforced a restrictive covenant on behalf of broker-dealer concerning a uranium broker's employment agreement, creating precedent for court interpretation of non-solicitation and non-competition agreements in New York.

Credit Suisse First Boston Corp v. Pitofsky, 4 N.Y.3d 149, 791 N.Y.S. 2d 489 (N.Y. 2005) , New York Court of Appeals decision regarding a dispute between the Form U-4 arbitration clause and a private arbitration forum selection clause in clients' employment agreements.

Cicconi v McGinn Smith & Co., Inc., 27 A.D. 3d 59 808 N.Y.S.2d 604 (1st Dep't 2005), Authored brief to the New York State Supreme Court, Appellate Division, and provided a genesis argument on defamation cases in the securities industry that resulted in the lead dissenting judge reversing her fifteen-year old precedent.

Gibson v. Bally Total Fitness Corp. et al, 1 A.D.3d 477, 767 N.Y.S.2d 135 (2nd Dep't 2003)

Fraternities / Sororities

Phi Sigma Kappa

Markus & Sheridan
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