Gregg Ribatt, a seasoned executive who helped to strongly build brands such as Sperry Top-Sider and Stuart Weitzman, has started to act as the new chief executive of Crocs. He takes the place left vacant by the retirement of John McCarvel last spring.

Andrew Rees will remain president and will report to him. Ribatt has already provided a lot of input for Crocs' transformation since January 2014 as a member of the board. He has served at the same time as senior advisor to the Blackstone Group, which began to invest in Crocs at the end of 2013. Jason Giordano, managing director of Blackstone, will join Ribatt on the board.

Ribatt, 46, is a fourth-generation footwear industry expert who has spent 20 years in the sector. After working for the Bennett Footwear Group for 11 years, Ribatt acted as president and CEO of Stuart Weitzman for two years and then joined the former Collective Brands in 2008 to run its Boston-based Performance & Lifestyle Group, comprising Sperry Top-Sider, Saucony, Keds and Stride Rite. He left in January 2013, after its takeover by Wolverine Worldwide. He has served most recently as interim CEO of Spanx.

At Crocs, Ribatt will be based at its new global commercial center in Boston and will continue to sit on its board of directors.