Langdon was a talented and generous mentor to her students, as well as to students from elsewhere who crossed her doorstep. Her door was always open to them, and she never gave the impression that she needed to be doing something else other than talking to them. Her students were welcome in her home, and she and her husband and daughter maintained lifelong friendships with them. It was through her leadership that the Yuman languages became one of the best-studied language families in California, with students doing dissertations and other research on the various languages in that family under Margaret's tutelage, and later with the guidance of her own students turned professors. Langdon's students have become professors in most of the major universities of the West. Langdon is survived by her daughter, Loni Langdon of Bishop, California, by a sister in Belgium, and by the many students and colleagues who held her beloved.