As general counsel and director of regulatory affairs at one of the U.K.’s biggest telecoms companies, Three U.K.’s Stephen Lerner oversees a 100-strong team responsible for driving legal, regulatory and commercial strategies at the company.

Before joining Three more than 15 years ago, Lerner was a lawyer in Clifford Chance’s London office for just under four years. It followed a spell at CMS, which he joined after emigrating to the U.K. from Canada.