Haas spent 14 years as a skipper in the farm system of the Atlanta Braves and replaced Joe Torre as Atlanta's manager after the 1984 season. His 1985 Braves squad went 50–71 (.413). With the Braves in fifth place in the National League West Division and 22 games out of the lead, Haas was fired on August 26, 1985, and succeeded by interim pilot Bobby Wine.

In his playing days, the 5 ft 11 in (1.80 m), 178 lb (81 kg) Haas was an outfielder who batted left-handed and threw right-handed. He graduated from St. John High School in Paducah and signed his first professional contract with the Chicago Cubs. He made the Majors with the Cubs in 1957 and was traded to the Milwaukee Braves in the offseason. His MLB career consisted of 55 games (1957–1958; 1960) with those two clubs, batting .243 with one home run. A broken ankle cost him the entire 1959 season.

He remained with the Braves after his minor league playing career ended, managing and coaching in the minor leagues (1965–73; 1978–84), and serving as a Major League coach (1974–77). After his brief MLB managerial career, he served as a special assignment scout for the Montreal Expos (1986–94) and Boston Red Sox (1995–2003).

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