William “Bill” Bain Jr., the founder of consultant Bain & Co. and private equity firm Bain Capital, has died at age 80. He died January 16 surrounded by family at his home in Naples, Florida, according to an obituary published by the Chapman, Cole & Gleason funeral home. Bain is survived by his wife, Ann Dean Bain, and his four children. “Bill’s enduring influence is as vibrant today as when he and a few colleagues first took the leap to start Bain & Company 45 years ago,” a spokesperson for Bain & Co. said in an emailed statement.