John M. Walker

John M. Walker Sr.
Born(1909-01-15)January 15, 1909
St. Louis, Missouri United States
DiedAugust 16, 1990(1990-08-16) (aged 81)
Biddeford, Maine United States
EducationYale University (BS)
Columbia University (MD)
OccupationsInvestment banker, G. H. Walker & Co., Alex. Brown & Sons
Medical career
ProfessionPhysician
FieldClinical assistant in surgery, 1949–1967
Chief physician (Hospital president), 1967–1975
InstitutionsMemorial Sloan–Kettering Cancer Center
Military career
BranchUnited States Army
RankMajor
ConflictsWorld War II

John Mercer Walker Sr. (January 15, 1909 – August 16, 1990) was an American physician and investment banker. A member of the prominent Bush-Walker family, he was a maternal uncle of US President George H. W. Bush.