Book excerpt: Summoned from the Margin tells the story of Lamin Sanneh's fascinating journey from his upbringing in an impoverished village in West Africa to education in the United States and Europe to a distinguished career teaching at the Universities of Yale, Harvard, Aberdeen, and Ghana. He grew up in a polygamous household in The Gambia and attended a government-run Muslim boarding school. A chance encounter with Helen Keller's autobiography taught him that education and faith are the key to overcoming physical and personal hardship and inspired his journey. Burning theological questions about God's nature and human suffering eventually led Sanneh to convert from Islam to Christianity and to pursue a career in academia. Here he recounts the unusually varied life experiences that have made him who he is today. Watch the trailer: