[1] He graduated from the University of Wisconsin in 1911, after which he worked as a pharmacist and, in 1912, he founded Rennebohm Drug Stores under a Rexall franchise.

During World War I, he attended officer candidate school and was commissioned an Ensign in the United States Navy.

When Governor Walter Goodland died shortly after his third term began, Rennebohm succeeded him, winning election to the governorship in 1948.

[3] During his tenure as governor, Rennebohm began a veterans' housing program financed by an increased liquor tax.

[6] Son of William Carl and Julia Brandt Rennebohm, he married Mary Fowler on September 8, 1920, and they had one daughter, Carol Ann.