Who is Mark Fuller from Expecting Adam: A True Story of Birth, Rebirth, and Everyday Magic and what is their importance?

Mark Fuller was John's boss during his time as a consultant on the Asia project. A short time before Adam was due and about the time the consulting job ended, John visited Mr. Fuller to let him know he would be resigning his position. When Mr. Fuller learned why John wanted to quit his job, Mr. Fuller offered to pay him for six months until he could finish his dissertation, stating that the dissertation would be good for the company. Without this offer, John most likely would have been forced to give up his Ph.D. aspirations in order to provide for his family.