Robert Frank "Rob" Grill was born November 30, 1943 in Los Angeles, California and was an American lead singer, songwriter and bass guitarist.

He was the central member of The Grass Roots and he launched a solo career in 1979, assisted on his solo project by several members of Fleetwood Mac. He then returned to leading The Grass Roots into the new millennium.

He was a native of Hollywood, California where he attended Hollywood High School. Soon after graduation, he began working at American Recording Studios with musician friends Cory Wells and John Kay (who later formed Three Dog Night & Steppenwolf).

Rob and The Grass Roots teamed up with mega-hit producer Steve Barri (The Mamas & the Papas, Tommy Roe, Four Tops and Dusty Springfield) and went on to chart twenty nine singles, thirteen of which went gold, followed by two gold albums and two platinum albums. In the new millennium, he released two live albums and one with a symphonic quartet.

Rob passed away on July 11, 2011