His father
The engineer
He built the parts of structures that nobody photographs. He came home from a full day, most of it standing, and sat down to check the mathematics the way he checked everything in his working life: completely. There was no partial credit in that house, because there is no partial credit in a structure.
When the neighbours came to use the telephone in the hall, he let them, every time, without once making anybody feel the size of the favour. For years he drove his son to meetings and waited outside, and it was never discussed as a favour either. A favour that is felt is not a favour. It is a debt with better manners.