workaholic

He has been described as 'a workaholic' who is said to work 14 hour days.

He was a 'workaholic', typically working up to 16 hours a day and subsisting on 4-5 hours sleep each night.

I thought 'recovering workaholic' was pretty good, though."

Randall Patterson must have been reeling when he finished his interview with Mark Cuban ("The Idled Workaholic").

Wayne Edward Oates (24 June 1917 - 21 October 1999) was an American psychologist and religious educator who coined the word 'workaholic'.

With the publication of Confessions of a Workaholic in 1971 he brought his neologism 'workaholic' into public use and it was soon included in the Oxford English Dictionary.