Thomas Donilon discusses his distinguished career in business and government, including his role as national security advisor under President Barack Obama, working with three U.S. presidents, serving at the state department, and his current roles at BlackRock and the Council on Foreign Relations. Lessons Learned is a roundtable series, open to term members and younger life members, which features distinguished speakers who reflect on their career experiences, the choices they made along the way, and the lessons they have learned from them.