Born in St. Louis, Missouri, he threw and batted right-handed and was listed as 6 feet 2 inches (1.88 m) tall and 187 pounds (85 kg).

Recalled by the Mets after spending four months of the 1962 campaign at Triple-A, Herrscher made his MLB debut on August 1, 1962, against the Philadelphia Phillies as a pinch hitter for Choo-Choo Coleman.

Facing southpaw Dennis Bennett, he reached based on an error by second baseman Tony Taylor.

[1] Four days later, he hit his only major-league home run, a three-run smash against Jim O'Toole of the Cincinnati Reds that was a key blow in a 5–2 triumph,[2] one of the Mets' 40 victories during their historically futile maiden MLB season.

His final major league appearance came on September 26, 1962, when he collected two hits, including a double, in three at bats against Denny Lemaster of the Braves, his original team.