John C. Maxwell writes leadership books for people who lead in everyday roles: the new supervisor, the team lead, the volunteer coordinator. His core idea is short enough to repeat in a meeting: leadership is influence, and influence can be learned.
That makes his books easy to read as a group. The 21 Irrefutable Laws of Leadership gives a whole team one shared set of principles to discuss. The 360 Degree Leader and The 17 Indisputable Laws of Teamwork speak to people leading from the middle of an organization, and short titles such as Make Today Count and Teamwork 101 fit a weekly book-club rhythm. Several titles have companion workbooks, so each participant can work through a chapter before the group meets.
His books suit new-manager programs and leadership retreats, and staff and volunteer development at churches, schools and nonprofits.