Adler returned stateside in April 1919 and reverted to the inactive status on May 10, 1919. He retain his reserve commission in the 306th Infantry Regiment and returned to his job with "The New York Times". He become treasurer and vice-president of "The New York Times" and following the death of his uncle, Adolph Ochs, in April 1935, he was appointed General Manager of "The Times". Adler was promoted to lieutenant colonel in 1923 and to colonel in 1930 in the Army Reserve. He assumed command of 306th Infantry Regiment in the Army Reserves in December 1924 and held it until his reactivation in October 1940.