• Co-organiser (with N. Trudinger and A. Devinatz) of the Emphasis year in PDE's; Northwestern 1988.
• Co-organiser (with M. Bertsch) of a Conference in Non Linear PDE's Torino Oct. 1989.
• Organiser of the Emphasis year in PDE's; Northwestern 1992.
• Organiser of the Session on Fluid Mechanics, International Conference on Free Boundary Problems, (auspices of the European Sc. Fundation), Toledo Spain, June 1993.
• Member of the International Programme Committee, L. Euler Mathematical Institute, St. Petersburg, Free boundary problems for Viscous Flows.
• Co-organiser (with G.Q. Cheng, T. Ilmanen and D. Tataru) of the Emphasis year in PDE's; Northwestern 1997.
• Co-organiser (with G.Q. Cheng, T. Ilmanen and D. Tataru) of the International Conference in Nonlinear PDE's , Evanston Ill. March 1998.
• Co-organizer of a Meeting on Mathematical Biology, at the Dyer Observatory, Vanderbilt Univ. (Sept 2001).
• Structuring the Biomathematics Study Group at Vanderbilt.
• 1999-2001 NSF-AMS Panel for Postdoctoral Fellowships.
• 2001-2005, AMS Committee on Publications.
• 2000-2002 University-wide TBIRT Committee (Trans-Institutional Bioinformatics Recruiting Team).
• 2003-2004 Vanderbilt SARC Committee College of Arts and Sc.
• 2002-2005 Vanderbilt Committee on University Lectures.
• 2003-2006 Vanderbilt Faculty Council
• 2003-2007 Vanderbilt Committe on Academic Standards
• 2003-2007 Vanderbilt Graduate Faculty Committee
• 2004 NSF-DMS National Committee of Visitors
• 2004 NIH Panels
• 2004 Co-organizer of Mathematical Modeling in Signaling Systems, (Vanderbilt June 2004).
• 2005 Vanderbilt Honor Council Committee
• 2005 NSF-NIGMS Panel
• 2005 Nominated for the Sutherland Prize
• 2006 Co-Organizer of a Meeting in Mathematical Biology at Oberwolfach, Germany, May 2006 (with B. Perthame and Angela Stevens).
• 2006 Co-Organizer of a Session in Degenerate Parabolic and Elliptic Equation (SIAM Annual Meeting, Boston July 2006 (with U. Abdulla).
• 2007 Co-Organizer of a Session in Modeling in Mathematical Biology (ICIAM Annual Meeting, Zurich July 2007 (with D. Kinderlehrer and Angela Stevens). Co-Organizer of a Session in Degenerate Parabolic and Elliptic Equation (SIAM Annual Meeting, Mesa AZ Dec 2007 (with U. Abdulla).
• 2008 Co-Organizer of a Session in Free Boundary Problems at the WCNA, Orlando FL, July 2008. (with G. Simonett and P. Guidotti)
• 2009 Co-Organizer of the Oberwolfach Meeting in Mathematical Biology, Oberwolfach, Germany, May 2009 (with B. Perthame and Angela Stevens).
• 2012 Co-Organizer of SIAM session in PDE's in Evansville (with U. Gianazza); Scientific Committee of the Intern. Meeting in Kingsville Texas A&M, Dec 2012.