Mark L Hammer is Professor Emeritus of civil engineering and is an author of environmental engineering publications in the United States and Saudi Arabia. During his long tenure as a professor at the University of Nebraska-Lincoln, Dr. Hammer also served as the Director of the Environmental Protection Agency Grant in Water Quality Control. He has taught at the King Fahd University of Petroleum & Minerals and King Abdul Aziz University, Saudi Arabia, where he conducted environmental engineering research in addition to his teaching responsibilities. He is a member of the American Water Works Association and the Water Environment Federation.