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

[2] http://www.linkedin.com/profile/view?id=81632430

[3] http://www.youtube.com/user/yousebastianmarshall