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Member of Professional Societies
- American Society of Civil Engineers, ASCE (Distinguished Member 2010-); Fellow 1993-2010; Member 1983-1993; Chair (1999-2000) and Vice-Chair (1998-99) of Executive Committee, Technical Activities Division, Structural Engineering Institute; Inaugural Fellow, Structural Engineering Institute (2012-); Chair of Three Technical Committees: Safety of Buildings (1990-94), Safety of Bridges (1995-97), and Optimal Structural Design (1994-98); Chair (2004) of Awards Committee, Technical Activities Division, Structural Engineering Institure; Chair of the Technical Administrative Committe on Structural Safety and Reliability (2006-2008); Founder and Chair of the ASCE-SEI Technical Council on Life-Cycle Performance, Safety, Reliability and Risk of Structural Systems - Approved by ASCE-SEI on November 7, 2008 (2008- ); Control Group Member of the Technical Commitee on Probabilitstic Methods, Engineering Mechanics Division (2006-2007); Engineering Mechanics Institute, Member (2010-)
- American Concrete Institute, ACI (Member 1983- ; Fellow 1997- )
- American Institute of Steel Construction, AISC (Member 2012- )
- Consortium of Universities for Research in Earthquake Engineering, CUREE (2003-2005; 2010- )
- Council on Tall Buildings and Urban Habitat, CTBUH (2007- )
- Earthquake Engineering Research Institute, EERI (1987- )
- International Association for Bridge Maintenance and Safety, IABMAS, President and Chair of Executive Committee (1999- )
- International Association for Bridge and Structural Engineering, IABSE (Member 1990- ; Fellow 2006- ); Elected Chair of IABSE Working Commission 1 on Structural Performance, Safety and Analysis, (2005-2009) ; Elected Member of IABSE Technical Committee, (2005-2009)
- International Association for Life-Cycle Civil Engineering, IALCCE, President and Chair of Executive Board (2006- )
- International Association for Structural Safety and Reliability, IASSAR, Chair of Executive Board (2006- ); Vice-Chair of IASSAR Technical Committee 3 on System Reliability and Optimization (2001-2010-); Chair of IASSAR Technical Committee 4 on Life-Cycle Performance, Cost and Optimization (2012- )
- International Federation for Structural Concrete, fib; Corresponding Member of Commission 2 on Safety and Performance Concepts (2006- )
- International Society for Health Monitoring of Intelligent Infrastructure, ISHMII, Vice-President (2004- ), Fellow (2009- )
- International Society for Information Processing, IFIP, WG 7.5 on Reliability and Optimization of Structural Systems, Chair (2003-2007)
- International Society for Structural and Multidisciplinary Optimization, ISSMO
- Joint Committee on Structural Safety, JCSS; Board Member and Representative of IABSE on the JCSS Board (2001-2009); Member of Working Party 1 on Structural Reliability (2001- )
- Transportation Research Board, TRB; Chair (1999-2007) of TRB AFF20(1) Methods of Analyzing Steel Bridges