Mitchell coached the Crimson for twelve seasons over three tenures (1916, 1926, 1929–1938), with his record being 216–134. Harvard joined the Eastern Intercollegiate Baseball League for the 1933 season, and he would lead them to their first ever regular season title with a 8–4 record in 1936 that tied for first with Dartmouth.
Mitchell guided the Crimson through twelve seasons across three stints (1916, 1926, 1929–1938), with his record standing at 216 wins and 134 losses. Harvard participated in the Eastern Intercollegiate Baseball League for the 1933 season, and he would take them to their inaugural regular season championship with a 8–4 mark in 1936 that tied for first place with Dartmouth.