He comes from a middle-class family who were involved in the construction industry. His mother (now retired) was a professor of mathematics.
He went to study in the United States in 1967.
He spent his first night in a $2/night room at the University Y-YMCA, and his first job was washing dishes for $1.20 an hour.
He had joined the Beta Theta Pi fraternity at UICC.
Khan became a US citizen in 1991, 24 years later.
He is a Muslim.