Amy Crosby and David Martens Crosby - Martens Mr. and Mrs. Ron Crosby of Ardmore, Okla. are pleased to announce the engagement of their daughter, Amy Marie to David Matthew Martens of Oklahoma City. The bride-to-be is a 2005 graduate from Ardmore High School, and a 2009 graduate of The University of Oklahoma. She is a Consultant with TKO Energy Services, LLC. The prospective groom is the son of Dr. and Mrs. Greg Martens of Madill, Okla. He graduated in 2005 from Madill High School, and in 2011 from The University of Oklahoma. He is a Land man with Turner Oil and Gas. The couple will exchange vows May 4, 2013 at the First United Methodist Church in Ardmore.