Mark Stallo has been employed by the Dallas Police Department since 1979. During his career he worked patrol in a variety of neighborhoods during days, evenings and nights. In August of 1985, Mark was promoted to sergeant and assigned to work three different patrol stations on the night shift. In November of 1988, he transferred to the planning division where he is currently responsible for the Crime Analysis Team. In 1990, he was responsible for working with a group of individuals in the creation of the International Association of Crime Analysis (IACA). Mark was Vice-President of Membership