Kariuki holds a Bachelor of Arts in psychology (1989 Magna Cum Laude) from Lee University and a Master of Arts in Clinical Psychology (1991) from East Tennessee State University. He also has a doctorate degree in education from ETSU.
Since joining Milligan’s faculty in 1995, Kariuki has taught courses in the Doctoral and Masters of Education programs in Research Methods, Data Analysis, Educational Statistics, and Advanced Child Development. He serves as Director of Research in Education and holds the W. Edward and Billye Joyce Fine Chair of Education. He also teaches undergraduate Life Span Human Development Psychology and Child Development Courses. In 2013, his first book, Never Underestimate God’s Child, was launched both in the United States and in his home country, Kenya. Since its publication the book has been featured in media throughout various nations.
Prior to moving to the United States, Kariuki worked as a weatherman at the meteorological headquarters in Nairobi, Kenya. He is a member of the Mid-South Educational Research Association, where he has served in executive positions for two decades. During a psychology tour throughout the United States, Kariuki interviewed prominent psychologists such as B.F. Skinner, Albert Bandura, Ulric Neisser, Albert Ellis, and Charles Brewer.
An ordained minister in the Church of God, Kariuki also serves as the senior pastor of East Johnson City Church of God.