A top Vodafone executive is leaving the firm to join Greensill, a fintech company with whom the telecom giant has previously entered into a complex and controversial financing arrangement.

Neil Garrod, Vodafone’s group treasury director, has been with the firm for more than a decade. During his tenure, Vodafone became a key Greensill client and a major investor in the GAM-Greensill Supply Chain Finance Fund, which is managed jointly by Greensill and Swiss asset manager GAM.