Intimacy Issues:
Joelle gives a good, solid answer (+1). This will reduce your him/he/his/they/them content reasonably. But I'd like to know how scholarly this needs to be and how well you know the person and their motivations. If the subject is familiar and it's not too formal, consider a more intimate, personal approach to the writing.
If you keep the point of view almost like a story, the implied identity of the person being discussed is the main character. The increased intimacy of a story character makes the biography very readable and entertaining. Consider your example:
After completing post-graduation in philosophy, Father thought a job in the family clothing shop would be a way to support the family and earn steady money. But a higher need won out over love, and a dream of talking to the masses meant a career as a teacher. Skills in communications required the practice provided by a job in education. For a few years at least, or that was the idea.
You know who the person is, and there's not a single pronoun in the whole thing. This is VERY informal, and won't work in a lot of circumstances. You need to really understand their motives to make this level of intimacy work. I took this to the extreme, but you can get away with fewer pronouns when the subject is completely implied.