In many people, the effects of brain aging may be magnified by depression.
"The effects of brain aging can be subtle and progress slowly, which makes them difficult to detect," he noted.
There was My Scientology Movie, a sly skewering of the celeb-hungry organisation, and two gut-punching docs exploring alcoholism and the unseen side effects of brain injuries.
His newest doc looks at the lasting, and sometimes surprising, effects of brain injury, while his recent one on alcoholism is still available on the BBC iPlayer.
"The often hidden effects of brain injury can make it difficult for people to get the diagnosis and help they need," he said.
The effects of brain injury can be catastrophic and long-term so the impact of more research would be vast, but affected numbers are too small so it loses out.
He deals primarily with patients struggling with the long-term effects of brain injury, the problems that start after the brain has been operated on and the skull put back together.
Yet, the league continues to ban the alternative painkiller despite growing evidence that cannabis is significantly safer than opioids, could reduce opioid dependence and could even diminish the long-term effects of brain injuries.
These stipulations could surprise some retired players, including those coping with the effects of brain trauma that have not progressed to the level of, say, Parkinson's disease.
Given the mounting evidence of long-term and even fatal effects of brain injuries incurred by professional football players, is it ethical for us to watch the games?
He will give his one-day salary to the team's foundation, which will donate it to an organization that studies the effects of brain trauma in athletes.
