Type 5?
(and not really important but you can do the tri-type if you want)

Howard Hughes - Wikipedia, the free encyclopedia

I think he is a 5 and interesting enough I think that in this regard the enneagram is brilliant at matching all of his strengths and weaknesses as a person. All of his strange behavior and problems could have been explained with the enneagram instead of a multitude of psychiatric diagnosis such as obsessive compulsive etc.