Two of Schein's students, Davis and Garrison, studied successful leaders who differed in ethnicity and gender. Their research presented evidence for the roles of: cheerleader, coach, confidant, counsellor, developer of talent, "griot" (oral historian for the organization or profession), guardian, guru, inspiration, master, "opener of doors", patron, role model, pioneer, "seminal source", "successful leader", and teacher. They described multiple mentoring practices which have since been given the name of "mosaic mentoring" to distinguish this kind of mentoring from the single mentor approach.