William Cross Jr. is an American psychologist known for his work in the field of racial identity development. He developed the Cross Model, which outlines stages that individuals of African descent go through as they form their racial identity. His research has significantly contributed to understanding how race influences personal and social identity. Cross is also recognized for his involvement in cultural psychology and has published various articles and books on the subject. His work has been influential in both academic and practical settings, helping educators and mental health professionals better understand the complexities of racial identity.