From wiki -
Sharon Rachel Osbourne (née Levy, previously Arden; born 9 October 1952) is an English music manager and promoter, television personality and presenter.
previously revived Ozzy's metal career and she stands as the founder of Ozzfest.[4]
Sharon met future husband Ozzy Osbourne at the age of 17 while working for her father, Don Arden, who managed Black Sabbath and was often accused of using violent tactics by his artists.[4] When Ozzy was fired from Black Sabbath in 1979, Sharon Osbourne took over his management from the Arden organization[4] and then started to date Ozzy.[4] Proving to be as hardworking and ruthless as her father,[4] Osbourne coordinated the recruitment of a technically gifted backing band, these members were Randy Rhoads, Bob Daisley, and Lee Kerslake for the recording of The Blizzard of Ozz and, by engaging proven songwriters, helped Ozzy launch what became a highly successful solo career. It was rumoured that Osbourne employed some of her father's tactics where one promoter was kneed in the groin after failing to produce due payments, and Osbourne single-handedly ruined a company's computer system after they sold illegal merchandise.[4]
In light of Osbourne's success managing Ozzy, she branched out into managing other acts by creating Sharon Osbourne Management. The new company, with Osbourne as its sole employee, managed artists such as Coal Chamber, The Smashing Pumpkins[4], Motörhead, ELO and Gary Moore. Osbourne also claimed to have worked briefly with Queen before being fired by Freddie Mercury. In the late 1990s Osbourne co-managed a band called Cube, with Cud guitarist Mike Dunphy. Cube were signed to Polydor Records but had limited success. Never one to mince words, in 2000 she made news by severing her relationship with The Smashing Pumpkins and then announcing in a statement: "...I must resign due to medical reasons... Billy Corgan was making me sick!"[4] She has also turned down career guidance requests from Fred Durst, Guns N' Roses and Courtney Love.[4]
More
here