...Reiner was about to make a fortune from Stemcentrx, a San Francisco-based biotech company he founded in 2008 and which developed experimental cancer treatments including the small cell lung cancer drug Rova-T.

He had studied post-graduate courses in genetics and biochemistry at Wayne State University and the University of California, San Diego, and he sold his start-up for $5.8 billion eight years later.

The deal with the Chicago-based AbbVie Inc also saw Reiner granted stock options worth up to $4 billion.

In 2019 he joined the board of Harvest Health and Recreation as the company began capitalizing on the wave of cannabis decriminalization sweeping the country to become one of the biggest suppliers in the US.