Robert Baker (USA, b. 12 July 1949) received an artificial aortic valve replacement on 27 October 1960 at St Vincent's Charity Hospital, Cleveland, Ohio, USA. His fourth replacement aortic valve was still working as of 8 November 2005. His heart had been damaged several years before when he had suffered an undetected attack of rheumatic fever. Mr Baker's valve-replacement surgeries took place in the following order: October 1960: by Doctors Kay and Zimmerman, at St Vincent Hospital, Cleveland, Ohio, USA. February 1964: by Doctors Kay and Zimmerman, at St Vincent Hospital, Cleveland, Ohio, USA. January 1982: by Doctors Kay and Zimmerman, at St Vincent Hospital, Cleveland, Ohio, USA. June 2003: by Doctors Pettersson and Grimm, at Cleveland Clinic, Cleveland, Ohio, USA.