Maximilian Adelbert "Madcap Maxie" Baer (February 11, 1909 – November 21, 1959) was a famous American boxer of the 1930s, onetime Heavyweight Champion of the World, and actor.

was born in Omaha, Nebraska, the son of German immigrant Jacob Baer (1875–1938) and Dora Bales (1877–1938). His older sister was Fanny Baer (1905–1991), and his younger sister and brother were Bernice Baer (1911–1987) and boxer-turned-actor Jacob Henry Baer, better known as Buddy Baer (1915–1986).

Baer's father was a butcher. The family moved to Colorado before Bernice and Buddy were born. In 1921, when Maxie was 12, they moved to Livermore, California, to engage in cattle ranching. Baer often credited working as a butcher boy carrying heavy carcasses of meat for developing his powerful shoulders.
Source : Wikipedia