Ken Griffin, CEO of hedge fund Citadel, may be a very successful hedge fund manager with a reputation for running a tight ship, but he is also a human being who likes to chat about his friends and who's been influenced by at least two significant women in his life.Get Morning Coffee ☕ in your inbox. Sign up here.One of those women was Griffin's grandmother, Genevieve Huebsch Gratz, who died in 2010 aged 98. Gratz, whose husband died nearly 50 years earlier, took on the running of the family oil company and the family farm (which initially had no running water) herself.