 It has been said “ Clark played a key role in shaping the George H. W. Bush administration’s efforts to nudge the apartheid regime in South Africa to peacefully relinquish power.“

Clark's parents were Warren Clark Sr. and Mary Dillon Clark, Clark graduated from the Hotchkiss School, Williams College, the Paul H. Nitze School of Advanced International Studies, Georgetown University and the John F. Kennedy School of Government.In 2005, Clark received a master's in theological studies from the Virginia Theological Seminary.He retires from the Foreign Service in 1996, was executive director of Churches for Middle East Peace for eight years, as well as “ as a consultant on privatization and liberalization of telecommunications in eastern Europe.“ 

A resident of Mason's Island, Mystic, Connecticut and Cleveland Park, Washington, DC, Clark died of cancer.