1965 he celebrated the movement's successes when President Lyndon Johnson signed the Civil Rights Act and Voting Rights Act. From 1964 to 1966 Walker worked with a new publishing venture, the Negro Heritage Library, which he headed as president in 1966. He worked with school boards and systems to expand curricula to improve coverage of African-American history and literature, and to add appropriate books to school libraries. Harlem, New York As a new Pastor in Harlem, Walker learned all that he knew and sat at the feet of his mentor Reverend Dr. BG Crawley Pastor and founder of the Little Zion Baptist Church, who was a Baptist Minister and New York State Judge in Brooklyn New York. In 1967 Walker was called as senior pastor of the influential Canaan Baptist Church of Christ in Harlem, New York, where he commanded a major pulpit in the struggle for tolerance and social justice. He also continued to compose sacred music. He connected his studies of other traditions to the use of music in the black church and social movements. Walker helped teach people about the relationship between movements around the world. During the years in which Africans sought independence, Walker hosted numerous leaders from the continent, including Nelson Mandela of South Africa, who were active in struggles against colonialism and apartheid. During the 1970s Walker served as Urban Affairs Specialist to Gov. Nelson A. Rockefeller, helping advise in a volatile social environment. In 1975 he completed his doctorate at Colgate Rochester Divinity School. In his graduate studies and research, Walker also studied at the University of Ife in Nigeria and the University of Ghana. During these years in Harlem, he wrote and published books on the relation of music and social movements, and community development. Walker was increasingly active in the anti-apartheid movement, which had a strong base in the African-American community. In 1978 he founded the International Freedom Mobilization to draw attention to the abuses of apartheid in South Africa. He served on the National Committee on the American Committee on Africa (ACOA) (since 2001 called Africa Action). In the 1980s he served on the ACOA Board, including as president. In 1988, during the height of the anti-apartheid struggle Walker helped co-found the Religious Action Network (RAN) of the ACOA, together with Canon Frederick B. Williams of the Church of the Intercession in Harlem. Walker also used the church's leadership in