Mark LandahlMark Landahl, Ph.D., CEM(R) has more than 23 years of experience spanning the fields of law enforcement, emergency management, homeland security, and higher education. After retiring as the Homeland Security Commander for the Frederick County (MD) Shriff's Office, he began service in his current position as the Emergency Manager for the City of Rockville (MD). In addition to professional practice, Dr. Landahl teaches at several universities as an adjunct professor. Read More Read Less