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William (Bill) Leinweber is the executive vice president and chief executive officer of the American Academy of Physician Assistants (AAPA). Prior to joining the AAPA, Mr. Leinweber was the executive vice president of Research!America, a national not-for-profit alliance dedicated to making medical and health research a higher national priority. 

Mr. Leinweber's career has included more than 20 years in senior positions advocating for the advancement of medical and health research and public health. During his 12 years with the American Heart Association (AHA), he served as executive director of the Ohio affiliate and as a senior management consultant and youth market team director for the AHA's national center in Dallas, Texas. Following his tenure with the American Heart Association, he served as the founding director of development for the Campaign for Tobacco-Free Kids in Washington, DC. The Campaign is the nation's largest private initiative ever launched to reduce youth tobacco consumption and addiction.

Mr. Leinweber received his MBA with honors from Ohio State University and his undergraduate degree with high honors from Marshall University.