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- National Academies Committee on Science, Engineering, and Public Policy (COSEPUP) – 2009-2011
- International Society for Stem Cell Research Program Committee – 2009-2011
- ASCB International Affairs Committee – 2009-2011
- California Institute for Regenerative Medicine, member of Scientific and Medical Research Funding Working Group – 2005–2010
- NIH Pioneer Award, Advisory Committee to Director (Phase I, II and III evaluations) – 2005, 2007
- Organizer, Society for Developmental Biology annual meeting – 2005
- Co-chair, Cold Spring Harbor Symposium, “Germ Cells” – 2004
- National Academy of Sciences, Temporary Nominating Committee, Class II – 2003-2006
- International Advisory Board of the Wellcome CRC Institute, United Kingdom – 2002
- Faculty of 1000, head of Developmental Biology section – 2001
- External Scientific Advisory Board for the Institution, Fred Hutchinson Cancer Research Center, Seattle, Washington – 2000–2006
- Scientific Advisory Board for the Biological Sciences Division, Fred Hutchinson Cancer Research Center, Seattle, Washington – 2000
- Scientific Advisory Board of the Max-Planck-Institut für Entwicklungsbiologie in Tübingen, Germany – 1997-2009
- Scientific Advisory Board for Searle Scholars Program – 1996-2001
- Editor, Science – 1996-1999
- Council, ASCB – 1994-1996
- Organizer, International C. elegans meeting – 1993
- Editor, Annual Reviews of Cell & Developmental Biology – 1992-1996
- Scientific Advisory Committee of the Damon Runyon-Walter Winchell Cancer Fund – 1992-1996
- Associate Editor, Developmental Dynamics – 1991-2000
- Associate Editor, Molecular Biology of the Cell – 1991-2001
- Editor, Journal of Cell Biology – 1991-1994
- Editorial board, Mechanisms of Development – 1990-2000
- Co-chair, ICN-UCLA Conference, Signal Transduction and Gene Activation During Development – 1990
- Co-chair, International C. elegans meeting – 1989
- Co-chair, Developmental Biology Gordon Conference – 1989
- Editorial Advisory Board, Developmental Biology Seminar Series – 1988-1996
- Editorial board, Cell – 1988-1997
- Editorial board, Development – 1987-1998