Coreen Sheehan is originally from Baltimore, Maryland. Currently she writes curriculum for and instructs Vocal Technique, Pro Performance Showcasing, and Teacher Training classes; Rock Vocal and Vocal English workshops; Artist Showcase performances, Accent Reduction, private lessons and open counseling at Musician's Institute of Technology in Hollywood, California. In 2008 Coreen won instructor of the year at Musician's Institute. Coreen also wrote vocal technique curriculum and was an advisor and instructor for seven M.I. Japan schools and instructed students at O.S.M. in Osaka, T.C.A. in Tokyo, and F.S.M. in Fukuoka, Japan from 1994-1999. She also taught at T.P.A. in Taipei, Taiwan.

Coreen was hired as a Music Consultant in 2003 for the VH1 television show You Rock, for which she prepared vocalists to perform in concert with artists such as Rod Stewart and the Barenaked Ladies. She has also been seen and heard in TV commercials in the U.S., Germany, Japan (MTV), and South Korea.

In 2002, 2003, and from 2005-2007 Coreen was nominated for the Best Rock Vocalist award in Los Angeles. She won the award in 2005, 2006, and 2007.

Coreen has toured professionally all over the world performing in bands such as the all-female AC/DC tribute band, Whole Lotta Rosies, and Tyed Dyed Junkies during her time in Japan. Her bands have opened for David Lee Roth and the Foo Fighters, and she performed background vocals on Richie Kotzen and Richie Zito's CD The Road. She has also performed with the Bricks Dance Company in Paris at the invitation of the Japanese embassy. Coreen continues to work with artists and bands, preparing them to record and perform worldwide.