I think Sheryl Louis is still her main manager, but Howard K was her management company.
http://www.pollstarpro.com/NewsConte...ticleID=829048
HOWARD KAUFMAN PASSES AWAY
By Joe Reinartz
Posted Thursday, January 19, 2017 at 10:12 am
Music manager Howard Kaufman has passed away, Pollstar has confirmed.
Kaufman was one of the most powerful managers in the industry despite keeping a low profile. At the time of his death his company, H.K. Management, shepherded acts like Stevie Nicks, Aerosmith, Jimmy Buffett, Jeff Lynne’s ELO, Lenny Kravitz, Chicago, and Def Leppard, along with co-managing Fleetwood Mac.
Kaufman and Irving Azoff ran Front Line Management from 1974 to the early '80s until Azoff was named prexy of MCA records. The two merged their companies in 2005 and resurrected the moniker.
Kaufman became a special adviser to Azoff when Ticketmaster bought the company in 2008 and Azoff was named CEO of Ticketmaster Entertainment. He is also credited, during his days at IFA, with encouraging Fred Bohlander and Dan Weiner to step out on their own and form Monterey Peninsula Artists.
Developing.