Mr. Kees Koolen is a Co-Founder of Koolen & Partners. He also serves as Chief Executive Officer & Chairman at Super B Lithium Power. He also serves as Senior Advisor at EQT Ventures. He was a Board Member of GetYourGuide Deutschland. He is a Co-Founder and Chairman of Lithium Werks. He joined EQT Partners in February 2015 as a Partner and Co-Head. He was an Advisor at Uber. Prior to joining EQT Partners, from 1997 until 2014, he was an Angel Investor of Booking.com, where he served as Chief Operating Officer, Chief Executive Officer. He was instrumental in transforming Booking.com from a small Dutch start-up to the biggest hotel booking site in the world.