TMR was founded as the result of efforts by the New York City Boy Scout Foundation beginning in 1924 to develop a camp large enough to accommodate the burgeoning growth of Scouting in the New York metropolitan area during the 1920s, with a goal of providing camping for 3,500 Scouts at a time. Led by future New York governor and President of the United States Franklin Delano Roosevelt (FDR), who was president of the New York City Boy Scout Foundation, the group selected TMR's present site, oversaw the land acquisition process from multiple owners, and raised funds for the large camp's development.