Abstract The present study focused on mentorship effectiveness from the perspective of the mentor. Specifically, factors related to relationship quality and learning were investigated. Mentors in relationships with others perceived to be similar reported the mentorship to be of higher quality and greater learning than did mentors in relationships with less similar others. Results also indicated that mentorship type (formal vs. informal) did not have a direct relationship with mentorship effectiveness, but did interact with mentorship duration. Additional results and implications are discussed.