Clinical Research Committee, Cystic Fibrosis Foundation (1997-2002).

Data Safety Monitoring Board, Cystic Fibrosis Foundation (1999-2006).

Chair, Data Safety Monitoring Committee, National Institute of Child Health and Human Development (2001-2006).

Program Chair, Institute of Mathematical Statistics, WNAR/IMS Joint Statistical Meeting, Los Angeles, California, June 23-26, 2002.

Program Co-Chair (with Jason P. Fine), Institute of Mathematical Statistics, ENAR/IMS Joint Statistical Meeting, Tampa, Florida, March 26-29, 2006.

Special Committee for Promotion (for Dr. F. Vonta), University of Cyprus, Cyprus, May 12, 2008.

Board of Trustees, National Institute of Statistical Sciences (2008-2016).

Program Co-Chair (with Xiaotong Shen), Institute of Mathematical Statistics, Joint Statistical Meeting, Washington, D.C., August 1-6, 2009.

Biostatistical Methods and Research Design (BMRD) Study Section, National Institutes of Health (2011-present).

Steering Committee Member for the SAMSI Innovations Lab on Interdisciplinary Approaches to Biomedical Data Science Challenges, July 20-24, 2015.

International Scientific Advisory Committee for the Medical Research Council Biostatistics Unit, Cambridge University, February 18, 2016.

Planning Committee Member, Discussant, and Participant in Workshop on “Refining the Concept of Scientific Inference When Working with Big Data”, National Academies of Sciences, Engineering, and Medicine, Washington, D.C., June 8-9, 2016.