Carl E. Marshall was raised in rural Oklahoma and received his Bachelor's and MA in Mathematics from Oklahoma State University and his Doctorate in Statistics from Iowa State. He became a professor of Mathematics at OSU and created the university's graduate program in statistics. He was known by his colleagues as "Mr. Statistics of Oklahoma."
David P. Marshall is the coauthor, with his wife, Kate, of The Book of You: For My Child, with Love; The Book of Us: A Journal of Your Love Story in 150 Questions; What I Love About You; What I Love About You, Mom; The Picture of Me: Who I Am in 221 Questions; and My Life Map: A Journal to Help You Shape Your Future. He lives with his family in northern California.