Executive Team

Mark Vorsatz has been the Chief Executive Officer and the Managing Director of our Private Client Services practice since co-founding Andersen in 2002 and has been a member of Andersen Group Inc.’s Board of Directors and Chairman since April 2025. Mr. Vorsatz has also been the Chairman of Andersen Global since 2013 and Chairman of the boards of directors of MDM and MDI since January 2025. Mr. Vorsatz has been instrumental in the formation of Andersen’s worldwide presence, spearheading the establishment and expansion of Andersen Global into more than 500 locations across the world. In addition to his management responsibilities as Global Chairman and CEO, Mr. Vorsatz continues to provide tax services, working exclusively with individuals in the design and implementation of customized income tax and estate planning solutions. Mr. Vorsatz has also served as the Chairman of the Andersen Institute for Finance and Economics since 2023 and on the board of directors of several privately held companies. Prior to founding Andersen, Mr. Vorsatz joined Arthur Andersen in 1979 and served as Partner from 1987 until 2002. Mr. Vorsatz holds an A.B. in Political Science and Economics from Stanford University and a J.D. from University of California, Hastings College of Law.

Peter Coscia has been Andersen’s East Regional Managing Director since January 2024, overseeing the provision of comprehensive tax services across the U.S. eastern region and Caribbean. Mr. Coscia has also served as a member of the boards of directors of MDI and MDM since 2018. Mr. Coscia has served in various leadership positions at Andersen since 2002, including Managing Director of the Metro New York office from May 2018 until December 2023. Prior to Andersen, Mr. Coscia worked as a Senior Tax Manager at Deloitte Tax, LLP in 2002 and at Arthur Andersen from 1991 until 2002. Mr. Coscia holds a B.B.A. in Public Accounting from Pace University and a J.D. from Brooklyn Law School.

William Deckelman has been Andersen’s Chief Legal Officer since January 2025. From July 2024 through December 2024, Mr. Deckelman served as Executive Vice President of the Howard Baker Forum, an organization that facilitates a variety of public policy programs and research projects, and a Senior Public Policy Advisor/Of Counsel at the law firm, Baker Donelson. Between 2008 and March 2024, Mr. Deckelman was the Executive Vice President and General Counsel of DXC Technology Company and its predecessor, a multinational information technology services and consulting company. Prior to joining DXC, Mr. Deckelman held various general counsel and in-house legal positions at several information technology companies, including Affiliated Computer Services, Inc., Electronic Data Systems Corporation and MTech Corp., and worked as an associate at Winstead PC and, later, as a partner at Munsch Hardt Kopf & Harr, PC, both of which are Texas based law firms. Throughout his career, Mr. Deckelman has served on a number of advisory boards and as a member of the board of directors of BriefBox Technology, an enterprise legal software company. Mr. Deckelman holds a B.A. in Political Science and an M.B.A. from Arkansas State University, a J.D. from University of Arkansas School of Law, an L.L.M. from Georgetown University Law Center, and an Executive L.L.M. from The London School of Economics and Political Science.

Daniel DePaoli has been with Andersen since 2002, serving in various leadership roles, and most recently as our Country Managing Director and Regional Managing Partner for North America since 2016. Mr. DePaoli oversees a significant portion of our operations and continues to provide private client services, specializing in tax consulting and compliance for individuals. Prior to joining Andersen, Mr. DePaoli worked at Arthur Andersen from 1990 until 2002, where he became Partner in 2001. Mr. DePaoli holds a B.A. in Economics from Hamilton College and an M.S. in Accounting from University of Hartford.

Neal Livingston has been Andersen’s Chief Financial Officer since January 2025 and Andersen Group Inc.’s Chief Financial Officer since April 2025. Prior to joining Andersen, Mr. Livingston served as the Global Chief Financial Officer for Freshfields, an international law firm, leading the firm’s finance division on a global scale from November 2021 until December 2024. From October 2016 until October 2021, Mr. Livingston was the Global Chief Financial Officer at Dentons, one of the largest international law firms in the world, overseeing all aspects of the firm’s global strategic and operational finance functions. While at Dentons, Mr. Livingston was also a member of the Global Management Committee and Global Board. Before entering the legal sector, Mr. Livingston primarily worked in banking, including leadership and management roles at the Commonwealth Bank of Australia from 2013 until 2016, the Royal Bank of Scotland from 2011 until 2013, Standard Chartered Bank between 2006 and 2011, Andersen Worldwide from 1992 until 2004 and Bank of America between 1988 and 1992. Mr. Livingston holds a B.A. in Business Administration from University of Brighton and an M.B.A. from UNC Charlotte Belk College of Business.

Gregory Vistica oversees investor relations for Andersen, bringing nearly 40 years of experience in financial communications, investor relations, and corporate positioning. Greg has advised Fortune 100 companies, high-growth startups, and mission-driven organizations on strategies that shape market perception, drive valuation, and build investor trust. Respected for his strategic insight into reputation management and messaging, he crafts compelling narratives that mitigate challenges, enhance brand value, and expand global visibility. As the founder, former Chairman, and CEO of Washington Media Group, Greg led high-stakes communications efforts on significant global issues, including #MeToo allegations at major US firms, overseas employee abductions, counterterrorism, and law enforcement and regulatory investigations. His leadership was instrumental in the 2014 rebranding of WTAS to Andersen. Prior to transitioning into communications, Greg was an award-winning investigative journalist at Newsweek, The New York Times Magazine, The Washington Post, and 60 Minutes II. His work earned prestigious accolades, including a Peabody Award, a George Polk Award, and Pulitzer Prize finalist honors, among other recognitions. As an author, Greg wrote The Education of Lieutenant Kerrey about Senator Bob Kerrey and Vietnam and Fall From Glory: The Men Who Sank the U.S. Navy. Both have been lauded for their in-depth reporting and insight into how public service journalism is crafted.