Miriam Roiter, the CTO at the hedge fund since 2016 and a member of Tudor's operating committee, is stepping away from the firm, according to sources familiar with the matter. Roiter has spent most of her career managing the tech and data evolution at Tudor, the $8.7 billion fund managed by billionaire Paul Tudor Jones that employs both discretionary and quantitative strategies. She's among a minority of women who hold top technology executive positions at major American corporations.