Originally a disc jockey in Australia at a very young age, Grierson immigrated to the US and jump started his career by doing record promotion for several labels, including Capitol Records. During that time he promoted The Beatles and was awarded the Golden Apple Award by them for “outstanding promotion in launching Apple Records”, in the US . At the Capitol, he was also Manager, International A&R/Promotion, where he signed Little River Band, and Director, Merchandising and Advertising. When Capitol created a second label, EMIAmerica Records in 1978, Grierson became VP, A&R. His many successes at EMIAmerica included Michael Johnson, Kim Carnes, Sheena Easton, Kate Bush, J.Geils Band and Kenny Rogers.

      In 1982, Grierson moved back to Capitol as VP, A&R where he signed and helped guide a number of hit-making acts, including Heart, Joe Cocker, Freddy Jackson, Melba Moore, Steve Vai, Megadeth, WASP and George Clinton. He was personally involved with the recording careers of Tina Turner, Bob Seger, Anne Murray, The Motels, Duran Duran, Power Station, Billy Squier, Ashford and Simpson and assisted in the emergence of Crowded House, Poison, The Smithereens and Great White.

     In 1987, Grierson resigned from Capitol to join CBS/Sony as Snr. VP, A&R, Epic Records where he personally signed and worked with such acts as Celine Dion (via Sony, Canada), Bad English, Iron Maiden, Basia, Tony Terry, Kaoma and The Cover Girls, as well as bringing his expertise to bear on the careers of Cheap Trick (finding their #1 single “The Flame”), Cyndi Lauper, Gloria Estefan, REO Speedwagon, The Jacksons and Europe. Under his direction, the Epic A&R staff also signed successful acts Living Colour, Indigo Girls, Allman Brothers Band, Alice Cooper, Social Distortion, Firehouse, Suicidal Tendencies, Front 2423, Ottmar Liebert and Joe Satriani.

     In 1993, Grierson created Drive Entertainment, a company with emphasis on classic artist and niche market catalog exploitation, where he compiled and packaged over 140 midline albums. In 1998 Grierson chose to re-enter the broader based music market and currently operates his own independent consultant company, doing executive producer A&R, working with labels, artists and publishers, both in the US and overseas as well as still researching and creating compilation packages. He is also a Music Supervisor for smaller budget films, recently completing the Constantin Films production, “Slap her, She’s French”.