He was for 20 years a partner in the Fairfax, Virginia law firm of Zaritsky & Zaritsky, where his practice was limited to estate planning and administration, and related tax matters. Before that, he was for eight years a legislation attorney for the Congressional Research Service, where his responsibilities included advising members of congress and committee staff on tax matters. He is a member of the Virginia State Bar and the Virginia Bar Association, and has been a lecturer at most major tax and estate planning institutes. He is the author or co-author of over 200 articles, three Tax Management Portfolios, and a dozen treatises.