Jack Robertson was an American businessman. He focused on creating hotels around the world to make a large profit.
Robertson built his hotels on repurposed land, and the one in Sheffield was constructed on top of an abandoned coal mine which was being used as a landfill site. He was not just aware of this, but he also knew that the waste in the landfill was toxic, but he willingly ignored it and turned a blind eye on it.
By 2018, he decided to run for the American presidency in the upcoming 2020 election. Apparently, he desired to do so because hated then president Donald Trump.
Whenever he heard Trump's name, he would visibly cringe.
In all of his hotels, he had underground safe rooms that he could lock himself inside if need be and live in isolation for roughly six months, catered by food, water, technology and weapons should he have to defend himself. He was vehemently against Great Britain's political ban on the use of guns in public use, thinking America was smart for allowing it's citizens to arm themselves. He considered shooting the problem to be "civilised." (TV: Arachnids in the UK)