Professional Activities

• Fellow, American Institute of Aeronautics and Astronautics (AIAA)
• Fellow, American Helicopter Society (AHS)
• Fellow, American Society of Mechanical Engineers (ASME)
• Fellow, American Academy of Mechanics (AAM)
• Editorial Board, Nonlinear Dynamics, 2012 – present
• Editorial Board, Journal of Mechanics of Materials and Structures, 2006 – present
• Editorial Board, Journal of the Korean Society for Industrial and Applied Mathematics, 2017 – present
• Editorial Board, Journal of Fluids and Structures, 2009 – 2020
• Editorial Advisory Board Member, The Open Aerospace Engineering Journal, 2007 – 2010
• Editorial Board, International Journal of Solids and Structures, 1996 – 2005
• Editorial Board, Journal of Engineering Mechanics, Oct. 2001 – Sept. 2003
• Editorial Board, International Journal for Engineering Analysis and Design, 1993 – 1997
• Associate Editor, Vertica, 1988 – 1991
• Associate Editor, AIAA Journal, 1981 – 1983
• AIAA Structural Dynamics Technical Committee, 1981 – 1983
• AIAA Structural Dynamics Technical Committee, 1977 – 1979
• Stability Committee, Engineering Mechanics Division, American Society of Civil Engineers, 1999 – 2007; Chairman, Oct. 2001 – Sept. 2003; Vice Chairman, Oct. 2003 – Sept. 2004
• Dynamics Committee, American Helicopter Society, 1988 – 1991, 1997 – 2000, 2005 – 2008
• Christian Faculty Leadership Network, Christian Leadership Ministries, 2000 – present
• Finite Element People

Technical Conferences/Sessions Organized and/or Chaired: 

• U.S. Army Research Office Technical Workshop on Rotorcraft Vibration, NASA Ames Research Center, Moffett Field, California, Feb. 22 – 23, 1978.
• 21^st Structures, Structural Dynamics and Materials Conference, Seattle, Washington, May 12 – 14, 1980.
• 24^th Structures, Structural Dynamics and Materials Conference, South Lake Tahoe, Nevada, May 2 – 4, 1983.
• U.S. Army Research Office Technical Workshop on Dynamics and Aeroelastic Stability Modeling of Rotor Systems, Georgia Institute of Technology, Atlanta, Georgia, Dec. 3 – 5, 1985.
• 30^th Structures, Structural Dynamics and Materials Conference, Mobile, Alabama, Apr. 3 – 5, 1989.
• Technology Workshop for Committee on Assessment of Research Needs for Wind Turbine Rotor Materials Technology, National Academy of Sciences, Washington, D.C., Jan. 22 – 23, 1990.
• Second Pan American Congress of Applied Mechanics, Valparaiso, Chile, Jan. 2 – 4, 1991.
• American Helicopter Society International Technical Specialists’ Meeting on Rotorcraft Basic Research, Atlanta, Georgia, Mar. 25 – 27, 1991.
• Southeastern Conference on Theoretical and Applied Mechanics, Nashville, Tennessee, Apr. 12 – 14, 1992.
• Third Pan American Congress of Applied Mechanics, São Paulo, Brazil, Jan. 4 – 8, 1993.
• 34^th Structures, Structural Dynamics and Materials Conference, La Jolla, California, Apr. 19 – 22, 1993.
• Fourth Pan American Congress of Applied Mechanics, Buenos Aires, Argentina, Jan. 3 – 6, 1995.
• 36^th Structures, Structural Dynamics and Materials Conference, New Orleans, Louisiana, Apr. 10 – 12, 1995.
• 37^th Structures, Structural Dynamics and Materials Conference, Salt Lake City, Utah, Apr. 15 – 17, 1996.
• 13^th National Congress of Applied Mechanics, Gainesville, Florida, June 21 – 26, 1998.
• 40^th Structures, Structural Dynamics and Materials Conference, Saint Louis, Missouri, Apr. 12 – 15, 1999.
• Dynamics Session Chair, 55^th Annual Forum of the American Helicopter Society, Montréal, Québec, Canada, May 25 – 27, 1999.
• AHS Aeromechanics Specialists’ Meeting, Atlanta, Georgia, November 13 – 14, 2000 (Technical Chairman).
• 15^th ASCE Engineering Mechanics Division Conference, Columbia University, New York, New York, June 2 – 5, 2002, Member of Conference Steering Committee, Organizer and Chairman of Technical Session.
• 16^th ASCE Engineering Mechanics Division Conference, University of Washington, Seattle, Washington, July 16 – 18, 2003, Member of Conference Steering Committee.
• 47^th Structures, Structural Dynamics and Materials Conference, Newport, Rhode Island, May 1 – 4, 2006.
• 2^nd AIAA MDO Specialist Conference, Newport, Rhode Island, May 1 – 4, 2006.
• Dynamics Session Chair, 63^rd Annual Forum of the American Helicopter Society, Virginia Beach, May 1 – 3, 2007.
• 49^th Structures, Structural Dynamics and Materials Conference, Schaumburg, Illinois, April 7 – 10, 2008.
• Session chairman, International Forum on Aeroelasticity and Structural Dynamics, Seattle, Washington, June 22 – 24, 2009.
• Session chairman, 8^th European Solid Mechanics Conference, Graz, Austria, July 9 – 13, 2012.
• Organizing Committee of the 49^th Annual Meeting of the Society of Engineering Science, Atlanta, Georgia, October 10 – 12, 2012.
• Session chairman and organizing committee member, 2^nd Symposium on Fluid-Structure-Sound Interactions and Control, Hong Kong, May 20-21, 2013, and Macau, May 22-23, 2013.
• Organizing committee member, 2^nd Asian/Australian Rotorcraft Forum, Tianjin, China, September 8 – 11, 2013.
• Member of International Advisory Board, 10^th Jubilee Conference on Shell Structures: Theory and Applications, October 16 – 18, 2013, Gdansk, Poland.
• Session chairman, SciTech 2014, Washington, DC, January 13 – 17, 2014.
• Session chairman and Track Chair, IMECE 2015, Houston, Texas, Nov. 16 – 18, 2015.
• Member of International Advisory Board, 11^th Conference on Shell Structures: Theory and Applications, October 11-13, 2017, Gdansk, Poland.