Some people see change coming and jump on an early bandwagon, as did Oni Chukwu of meetings tech platform Etouches with data protection. Some make change happen via government, such as General Data Protection Regulation godfather Jan Philipp Albrecht and U.S. travel ban designer Donald Trump. Some challenge the status quo like Certify's Bob Neveu, whose company has become the closest thing to a challenger Concur's got. Some, like Uber CEO Travis Kalanick, demonstrate negative leadership, leaving minefields for new leaders to diffuse. Others play unwitting roles that nevertheless create change for the better; take airline passenger David Dao. Read up on the 25 people who wielded the most influence on corporate managed travel in 2017.