Father Oscar Lukefahr, C.M. is a Catholic priest, theologian, writer, and Christian apologist. He has written many books and pamphlets (tract) on the subjects of Catholicism meant as an introduction or re-introduction to the Faith. He operates the Catholic Home Study Service from the Archdiocese of St. Louis. He is a member of the Vincentians and a devout supporter of the Knights of Columbus. He operates a webpage from which he distributes free Catholic literature to thousands of people per year, mostly to RCIA students.