Kerner was born in
Chicago, Illinois, on August 15, 1908, the son of Rosalie [née Chmelíková] (1885–1979) and
Otto Kerner Sr. (1884–1952). His mother was born in
Lišov and came to America with her parents and sisters. Born into the Czech community of Chicago, he was named after his father. After graduating with an
Artium Baccalaureus degree from
Brown University in 1930, Kerner attended
Trinity College, Cambridge in England from 1930 to 1931. In 1934, he received a
Bachelor of Laws from
Northwestern University School of Law in Chicago and was admitted to the Illinois bar. On October 20, 1934, he married Helena Cermak, daughter of the late
Anton Cermak, who had been mayor of Chicago before he was shot and mortally wounded in
Miami, Florida, in 1933 by
Giuseppe Zangara in what may have been an attempt on the life of president-elect
Franklin D. Roosevelt. Kerner joined the 33rd Division of the Illinois
National Guard in 1934 and because of his time in the National Guard he was quickly granted a commission when the Second World War broke out. In 1942, he entered active duty in
World War II, serving as a field artillery officer in the
9th Infantry Division of the
United States Army in North Africa and Italy and in the
32nd Infantry Division in the Pacific. He was awarded the
Bronze Star Medal for merit and the
Soldier's Medal for rescuing a drowning soldier off the coast of
Sicily. He was released from active duty in 1946 as a
lieutenant colonel and rejoined the Illinois National Guard. In the 33rd Division, Kerner was promoted to the rank of
colonel in the
Illinois Army National Guard that same year and to
brigadier general in 1951. He retired from the
Army National Guard in 1954 as a major general. During his time in the Army, Kerner deeply impressed his commanding officer at the time,
Jacob Arvey, who was also the leader of the Cook County Democratic party. This friendship proved beneficial to Kerner as it garnered him much support from local politicians, notably
Richard J. Daley, who supported Kerner as a Democratic nominee. == Political career ==