Given the task definition and input, reply with output. Read the passage and find the corresponding person for the given pronoun. The word between ** ** is the target pronoun.

By the end of 2002, Dyer engineered Schumacher at the tests, and after the championships had been won, at the last three races at Monza, Indianapolis and Suzuka. Dyer then race engineered Michael Schumacher to **his** 2003 and 2004 world titles, famously appearing with the German on the podium after his triumph at the 2003 Canadian Grand Prix.
Dyer