Pellebon has been on family and medical leave since Oct. 5, Bishop said.
Donald Baker, OU School of Social Work academic director, said he could not comment on the allegations Tuesday but said the complaints are under investigation.
According to his curriculum vitae, which is a type of academic resume, Pellebon holds a bachelor's degree in social work from Southern University at New Orleans, as well as a master's degree in social work and a doctorate in social welfare from the University of Wisconsin — Madison.
Courses Pellebon teaches focus on sexual behavior and values, problems in human relations and cultural diversity and oppression.
His primary research interests include human sexuality, mental illness and ethnic identity, according to his curriculum vitae, which is posted on OU's website.
He also has served as the faculty adviser for the Undergraduate Students of Social Work Association and the OU chapter of the NAACP.
In addition, he has served as a mentor for Bridge Builders, an organization that works with black OU student athletes.