His about page [1] says "strategist, entrepreneur, technologist, avid reader and writer, casual historian, cowboy scientist, and I like doing some adventure and travel type stuff".
His LinkedIn [2] says "Real Estate, Project Management, Technology, Philanthropy, Writing".
His youtube channel [3] is full of lectures about strategy.
Sooo..."life coach" mashed up with "strategy consultant" or something equivalent? Of course, you could ask, "Does it matter what his credentials are?"
[1] http://sebastianmarshall.com/new-start-here