[1] In 1972, he moved up to Minnesota's AA level Charlotte affiliate, and in 1973 he started the season with AAA Tacoma and had 10 wins and 5 losses when he was called up to the major leagues in July.

[1] Campbell rose to the occasion; his 78 appearances led the league, and his record was 17 wins, 5 losses, 20 saves, and a 3.01 ERA.

[1] Campbell became a free agent after the 1976 season and signed a four-year contract with the Boston Red Sox.

[1] On March 26, 1984, the Cubs traded Campbell and Mike Diaz to the Philadelphia Phillies for Gary Matthews, Porfi Altamirano, and Bob Dernier.

[4] On April 6, 1985, the Phillies traded Campbell and Iván DeJesús to the St. Louis Cardinals for Dave Rucker.

According to 1987 news articles, Campbell was among those who were swindled by sports agent LaRue Harcourt, and lost approximately $800,000.