NorthStar Moving Co. began getting celebrity clients soon after the Los Angeles-based company was founded 20 years ago, owner Laura McHolm says. It has done work for production companies, and that has helped bring it many clients in entertainment; Holm estimates 15 percent of NorthStar’s work comes from the industry. Celebrities hire NorthStar because it provides services for people who want their private lives to remain private, McHolm says.