1990 - 1992, 1996-present, Member, American Association of Immunologists
1994 - present, Member, American Society for Cell Biology
1994 - present, Member, American Assoc. for the Advancement of Science
2000 - 2005, Associate Editor, Journal of Immunology
2004 - present, Editorial board, Pigment Cell and Melanoma Research
2004 - 2008, Editorial board, Traffic
2006 - 2020, Board of Reviewing Editors, Molecular Biology of the Cell
2008 - 2011, Associate Editor, Traffic
2008 – present, Member, American Society for Biochemistry and Molecular Biology
2008 – present, Member, Pan-American (2008-2013) or European (since 2013) Society for Pigment Cell Research
2010 – 2012, Council, Pan-American Society for Pigment Cell Research
2011 - 2015, Editorial board, Journal of Cell Science
2012, Chair, Gordon Research Conference on Lysosomes and Endocytosis
2012 - 2020, Co-editor, Traffic
2013 - present, Guest editor, PLoS Genetics
2013 – 2017, Ad hoc member, ACTS and MBPP study sections, National Institutes of Health
2014, Local Organizer, American Society for Cell Biology Annual Meeting
2017 - present, Scientific Committee, European Days of Albinism
2017 - 2021, Member, MBPP study section, National Institutes of Health
2019 - 2021, Chair, MBPP study section, National Institutes of Health
2021 - present, Editor, Molecular Biology of the Cell