Defeated fellow contender Orville Brown to win the vacant championship and win the inaugural and vacant MWA title established January 1940. Both contenders had previously challenged (and failed to defeat) Everette Marshall in different matches in Ohio months apart in 1937.
29 May 1936 in the Houston Post Brown was specified by Jim Londos as the strongest grappler he had ever faced, and that he had wrestled him "a few nights ago" to a two-hour draw in Detroit. 21 September 1936 Brown was named one of the top twenty contenders for the World’s Heavyweight Championship in Houston, Texas by the members of the National Wrestling Association.
1 June 1937 Bruns unsuccessfully challenged World Champion Everette Marshall at the Public Hall in Cleveland, Ohio. The match ended in 44:48 when Bruns was laid out and unable to recover.
28 October 1937 Brown lost an important Columbus, Ohio match to Everette Marshall, the recognized holder of one of the World Championships. It drew 10 000 people, setting a city record. He lost one other, but then managed to tie Marshall in a third match on 16 December.
1 January 1938 Brown wrestled Pesek to a 90 minute draw. 17 August 1938 Pesek was stripped of the NWA world title and immediately awarded the MWA world title (Marshall's old title) instead.
Dave Levin defeated Brown in a one-fall match on April 27, 1944 in Kansas City, Kansas, and laid claim to the title. However, Brown claimed that the title could only change hands in a two-out-of-three falls match.
^Wrestling-Titles: Orville Brown - biography: "On Nov. 10, 1939 at Bridgeport, Conn., Bobby Bruns defeated Jack Pfefer's world light heavyweight champion Maurice Boyer. From that point forward in New England and the Atlantic Coast, the title changed to a heavyweight title and Pfefer billed Bruns as heavyweight world champion .. On Jan. 18, 1940, Bruns defended this title in a clean win over Brown."
^LegacyOfWrestling Bobby Bruns Wrestling History: "On January 11, 1940, Bruns beat Andy Mexiner in two-straight falls in Kansas City. A week later, he returned to the Memorial Hall to wrestle Orville Brown for the vacant World Heavyweight Title, recognized by the state of Kansas and by promoter George Simpson. He won the first in 40:30 and then the 3rd in 5:00 to capture the championship."