Daniel Leith enlisted in the United States Marine Corps in November of 2005. Upon completion of bootcamp and infinity school, Daniel served for 2 years in Kings Bay Georgia. He then received orders to 3rd battalion 6th Marines where he was meritoriously promoted to the rank of Sargent and served as an Infantry Squad Leader during Operation Moshtarak. Daniel was awarded a Bronze Star with combat V for actions during this Operation. Daniel then received orders to Quantico VA to the Martial Arts Center of Excellence where he taught for the last three years of his enlistment. During this time Daniel instructed thousands of officers and enlisted Marines in Martial Arts technique, Strength and Conditioning, as well as Nutrition. While in Quantico, Daniel achieved the Martial Arts ranking of 4th Degree Black Belt Martial Arts Instructor Trainer. Daniel was Honorably Discharged December of 2013.
After leaving the Marine Corps, Daniel followed his passion for martial arts and nutrition. He successfully partnered up with fellow Marine veteran George Lockhart to start Lockhart and Leith Nutrition. This continuously growing company is currently one of the most sought after for weight management and performance nutritionists in the world. Lockhart and Leith clients include Grammy Nominated Recording Artist Demi Lovato, UFC Lightweight Champion Conor McGregor, UFC Light Heavyweight champion Daniel Cormier, 2 time UFC Heavyweight champion Cain Velasquez and UFC Middleweight Champion Luke Rockhold, as well as many others.