Mark has represented public companies, their audit committees, and various executives in SEC investigations into financial reporting and accounting fraud, Foreign Corrupt Practices Act violations, alleged insider trading, and violations of various broker/dealer and investment advisory rules and regulations. He has also conducted a number of internal investigations, and defended clients in state and federal criminal investigations and SRO inquiries into securities related matters.

Prior to joining Arent Fox, Mark was a partner in the litigation department of a national law firm residing in Washington, DC. Previously, he was the chief of staff to SEC Chairman Harvey Pitt, and also served previously as an attorney in the US Securities and Exchange Commission’s Division of Enforcement.

Mark has taught "SEC Enforcement" in the LL.M. program as an adjunct professor at Georgetown University Law Center for more than a decade.

Mark recently wrote a chapter titled “U.S. Law – The Foreign Corrupt Practices Act and Beyond” in the book International Corruption Law by P. Cohen and A. Marriott. Other publications include:

• “Does Severe Punishment Deter Financial Crime,” University of Charleston Law Review (2010)

Mark and his wife, Helen, enjoy and support the performing arts, particularly in the greater Washington, DC region.