Who is Henry Pierce (Einstein) from Chasing the Dime: A Novel and what is their importance?

Henry and his fiance Nicole have just split up after three years together. She says goodbye to him using a term of endearment from before things went sour. It had been some time since she called him Hewlett which was her play on his initials of HP. He leaves her with everything, largely to assuage his guilt for letting things get so bad that it has come to this. He starts over with six boxes of clothes, knowing he will miss the house on Amalfi, and the woman still living there. He plugs in his new phone and it rings almost immediately. His assistant Monica set the service up for him, and he goes over the instructions she left him for its operation, noting that the new number has already been circulated to his A-level email list of almost eighty people.