A right-hander whose pro career extended from 1961 through 1968, he was listed as 6 feet 1 inch (1.85 m) tall and 180 pounds (82 kg).

[1][2] After spending 1965 at Triple-A, Umbach worked in 22 games during 1966, the Braves' first year in Atlanta, losing his only two decisions but posting a solid 3.10 earned run average.

Of his 22 appearances, three were starts, and on June 4, he held the St. Louis Cardinals to seven hits and one unearned run, again going 81⁄3 innings.

But he departed the game with the score tied at one, and his reliever, veteran Ted Abernathy, got credit for the victory when Atlanta broke through with the winning tally in the home half of the ninth.

After the 1966 season, he was included in a blockbuster trade that sent longtime Braves star Eddie Mathews, also a future Hall of Famer, to the Houston Astros.