Who molded Barack Obama?

Barack Obama had a number of influences that molded and shaped the person he became. He has spoken of the role of his mother, his maternal grandparents, his wife, and several of his professors. But he was also molded by someone who was not there-- his biological father, who left when Barack was only two and had virtually no contact with him throughout his life. President Obama has said this had a profound effect on him, making him more determined to be a good husband and father, as he felt his own dad had never been.