Ms. Guest asked Putnam to find a suitable candidate and he eventually came up with the still then unknown,
Amelia Earhart. Following her successful flight, Putnam organized Earhart's public engagements and speaking tour across the United States. Shortly after, he took charge of promoting her career and arranged for endorsement contracts with a
luggage manufacturer and a line of ladies' sportswear. In addition, Putnam published two books Earhart wrote about her flying adventures.
In 1930, the various Putnam heirs voted to merge the family's publishing firm with Minton, Balch & Co. who became the majority stockholders. George P. Putnam resigned from his position as secretary of G. P. Putnam's Sons and joined New York publishers, Brewer & Warren as vice president. Having divorced in 1929, the extensive amount of time Putnam spent with Amelia Earhart resulted in an intimate relationship and, in 1931, they married.
During their marriage, Putnam continued to manage his wife's career. On a personal level, they shared many common interests: hiking, swimming, camping, riding, tennis and golf. Following his wife's 1937 disappearance while attempting to set another flying record, Putnam published Earhart's biography in 1939 under the title
Soaring Wings. Putnam later donated many of Earhart's belongings, including a flight jacket, to
Purdue University where she had worked as a career counsellor. Other personal effects were sent to the Women's Archives in New York. In 1938, he set up a new publishing company, George Palmer Putnam Inc. in California.
The following year, Putnam had his wife declared dead on
5 January 1939 and remarried on
21 May 1939 to Jean-Marie Cosigny James.