Member; 1976-2012; Vice Chair, Committee Operations of the Section of Taxation, 1998-2000; Chair, Committee on Estate and Gift Taxes of the Section of Taxation, 1986-1988; Chair, Committee on Government Submissions of the Section of Taxation, 1991-1993, American Bar Association
Fellow, American College of Tax Counsel, 1993-2012
Fellow, 1988-2012; President, 2003-2004; Regent, 1996-2005; Chair, Business Planning Committee, 1997-2000, The American College of Trust and Estate Counsel
Academician, 1993-2012; Member, Executive Council, 2001-2004, The International Academy of Estate and Trust Law
Member, The Bar Association of the District of Columbia, 1984-2012
Member, Advisory Committee, University of Miami Philip E. Heckerling Institute on Estate Planning, 1999-2012
Member, Editorial Board, Estate Planning , 1993-2012
Member, Board of Advisors, Business Entities , 1999-2012
Member, Advisory Board, Tax Management Estates, Gifts and Trusts Journal , 1999-2012
Member, Board of Regents, Trinity International University, 1993-1997, 2000-2006, 2007-2009
Member, Board of Visitors, University of Minnesota Law School, 1998-2004
Moderator, 1995-1997, 2007-2009; Vice Moderator and Chairman of the Board of Directors, 1993-1995, Member of the Board of Directors, 1986-1992, 1993-1997, 2007-2011, Evangelical Free Church of America
Member, Christian Legal Society, 1998-2012
Fellow, American Bar Foundation, 1993-2012
OSCE International Observer, Bulgarian Parliamentary Elections, April 19, 1997