David Bird left as director and head of proposition development at LifeSight, Willis Towers Watson's multiemployer defined contribution plan, a spokeswoman confirmed.
Mr. Bird was responsible for plan design at the £7.5 billion ($9.1 billion) LifeSight. He previously served as senior consultant at Willis Towers Watson, advising on auto enrollment and retirement planning.
Details about his replacement and reasons for his departure were not available.
Mr. Bird could not be immediately reached for comment.