Dr. Feigelson practices in a variety of areas within patent and intellectual property law. His work has included litigation, drafting opinions of counsel, performing transactional IP due diligence, and preparing and prosecuting patent applications. He practices across several fields and industries, including financial services and electronic communications, with a particular emphasis in the computer software arts and business methods, and with clients ranging from Fortune 100 to startup. He has litigated cases involving patents, trademarks and trade secrets, and has represented clients in a number of matters involving the Computer Fraud and Abuse Act and the Stored Communications Act.

After receiving his doctorate, Dr. Feigelson worked as a management consultant in the telecommunications and financial services industries. Prior to joining Leydig, Voit & Mayer, Ltd. in 2003, he worked as an associate at the Boston law firm of Testa, Hurwitz & Thibeault.