Who is Mr. Schultz (Howard's father) from Pour Your Heart Into It and what is their importance?

Howard's father is not an active person in the timeline of the Starbucks story but he is the driving force behind Howard's behavior and is always present in Howard's mind as Howard makes decisions for Starbucks. Howard's father is a good man but has no advanced education or training and works in a long line of unskilled jobs barely able to provide for his wife and three children. Even as a child Howard does not understand his father's dilemma which keeps the family mired in their desolate circumstances and Howard wishes his father could be more aggressive in order to change their lives for the better.