After five decades of mentoring relationship research, the evidence is irrefutable: people who have strong mentors accrue a host of professional benefits, including more rapid advancement, higher salaries, greater organizational commitment, stronger identity, and higher satisfaction with both job and career. They also see personal benefits, such as better physical health and self-esteem, ease of work-life integration, and strong–er relational skills. At its best, mentoring can transform lives and careers while bolstering retention and maximizing employee potential.