Member American Bar Association (section labor and employment law since 1975, subcommittee antitrust, RICO and labor relations law), Association Bar City of New York (secretary committee labor and employment law 1984-1987), New York State Bar (commercial-federal litigation section co-chair labor and employment law committee 1995-1997).
William C. Zifchak, lawyer. Bar: New York 1974, United States Court 2nd District Court of Appea circuit) 1975, United States Court Appeals (3d circuit, District of Columbia circuit) 1983, United States District Court (southern district) New York, 1984, United States District Court (eastern district & northern dist), 2000. Named a Super Lawyer, New York, 2006-2011.
- Partner, co-chair labor and employment law department Kaye, Scholer, Fierman, Hays & Handler, New York City. Planning committee New York University Annual National Conference Labor, 1991-1997.