Which famous people use 4:30 a.m. wake-up?

Jocko Willink

Wakes at 4:30 a.m. and works out before dawn

Business Insider's day-in-the-life profile says Willink's day starts at 4:30 a.m. with a pre-dawn workout.

“It begins at 4:30 in the morning.”Jocko Willink

Source: A day in the life of a retired Navy SEAL commander who wakes up at 4:30 a.m. (article)