Starting around 1912, Coffeen played for several amateur football teams based in
Green Bay. Fellow Green Bay football player
Wally Ladrow recalled defeating Coffeen's "city team" for the Green Bay championship in one year. In November 1917, he organized a
Red Cross benefit game featuring the Green Bay All-Stars, who defeated the Marinette Badgers by a score of 27–0. Among the players for the All-Stars was
Curly Lambeau, who scored two
touchdowns in the game. In 1919, he joined Lambeau's newly-formed
Green Bay Packers as a
quarterback and
halfback. Coffeen was one of two quarterbacks, alongside
Dutch Dwyer, in the Packers' first-ever game, a 53–0 defeat of the Menominee North End Athletic Club. He ended up appearing in 10 games in the 1919 season, six as a starter, with five coming at quarterback and the other at left halfback. He contributed to the Packers winning their first 10 games before a loss to the
Beloit Fairies in the season finale by a score of 6–0. During his football career, Coffeen measured at and weighed . The following year, Coffeen became an
official working at Packers games. He began working for the American Professional Football Association (APFA), now known as the
National Football League (NFL), in 1921, as an umpire and head linesman. He remained an APFA/NFL official until 1925. In either 1923 or 1926, Coffeen became the Packers' first
public address announcer. Starting off with "primitive equipment" at the Packers'
Bellevue Park, he served close to 30 years as the "Voice of the Packers". He retired from announcing after the 1953 season, due to a heart ailment. For his service to the NFL, the league awarded him a lifetime pass to all games in 1954. Coffeen was also a prominent
bowler and
golfer in the area, being a member of the team that won the 1924 state bowling championship. ==Personal life and death==