Society service:

1976 - Nominating Committee, American Fern Society

1977 - Nominating Committee, Paleobotanical Section, Botanical Society of America

1979-1980 - Nominating Committee, Botanical Society of Washington

1977-1983 - Records Treasurer, American Fern Society

1982-1985 - Elections Committee, Botanical Society of America, Chairman in 1985

1983 - Nominating Committee, American Fern Society

1983-1986 - Editorial Board Representative American Journal of Botany , Bot. Soc. Amer.

1984 - Award Committee, BSA Paleobotanical Section

1986-1987 - Vice President, American Fern Society

1987-  IAPT Committee for Fossil Plants (1993-2005, Secretary; 2005 – 2009, Chair)

1988- Program chairman, Pteridological section, Botanical Society of America

1988-1989 - President, American Fern Society

1989-1990 - Chair, Paleobotanical Section, Botanical Society of America

1990-2009 - AIBS Representative, American Fern Society

1991 - American Fern Society Nominating Committee

1993 - American Fern Society Nominating Committee, chair

1993-1996 - Organizing Committee for IOP international meeting

1995-1996 - Chair of Financial Awards Committee for IOP Conference

1995 - American Fern Society Nominating Committee                                                                                                            

1997, 2004 - AIBS Nominating Committee

1997, 2004 - BSA Paleobotany Section Nominating Committee

1997 - 2004 - IAPT Committee on Names in Current Use

1997 - American Fern Society Best Paper Awards Committee

1998 - 1999 AIBS Publications Committee (Chair, 1999)

1998 - BSA Pteridological Section Nominating Committee

1999 - BSA Paleobotanical Section Nominating Committee

1999 - Editorial Committee, International Code for Botanical Nomenclature

          2005 – Nominating Committee for AIBS

          2006-2009 – American Fern Society Council member

          2009 – 2010 - President-elect, Botanical Society of America

          2010-2011 - President, Botanical Society of America