In 2057, when the Crogs first attacked Earth, McMullen was a Councillor for the Earth Coalition. He was also one of the few humans who saw the Avatar when he appeared on Earth to announce the Great Truce and the Great Race of Ōban.
By 2072, McMullen had become a Governor and attended the first friendly race between Earth and two of its neighbors. He was there the day that Maya raced against Spirit, and witnessed her tragic accident.
In 2082, McMullen is now the President of the Earth Coalition. His main concern seems to be having the Earth Team win the Great Race of Ōban and obtain the Ultimate Prize, though he does not explain why right away. He does not inform Don Wei of the danger Earth is in until after the race has begun, nor does he tell him what the Ultimate Prize is until even later.
By the time the Earth Team gets to Ōban, the President's worst fears are coming true; the Crogs are preparing to attack Earth as soon as the race is over. Under these circumstances, the President pushes Don Wei to make his team win even harder than before, not seeming to care that Don's own daughter is the pilot risking her life for their planet.