Numerous Ohio Wesleyan alumni have been associated with social justice. Branch Rickey (1904) was a baseball manager and executive known for signing Jackie Robinson as the first African-American in Major League Baseball. Another graduate, Mary King (1962), worked alongside the Rev. Dr. Martin Luther King Jr. in the U.S. civil rights movement when she was a young student, and was a member of the staff of the Student Nonviolent Coordinating Committee (SNCC). Rev. Norman Vincent Peale (1920) was the author of "The Power of Positive Thinking" and the winner of a Presidential Medal of Freedom for his theological contributions. Others found fame in other forms: Mildred Elizabeth Sisk (aka Axis Sally) was the first American woman to be tried and sentenced for treason, convicted of broadcasting for Nazi Germany during World War II. In 1917, she majored in dramatic arts, but did not graduate due to her failure to meet all university requirements. After serving a 12-year sentence, Sisk returned to OWU, where she received a bachelor's degree in speech in 1973.