Chris Grollnek is an expert in workplace violence prevention and response to active shooter incidents. He has a strong interest in Lieutenant General Lewis "Chesty" Puller, the most decorated Marine in history. Puller joined the Marines in 1918 and saw action in numerous conflicts over 37 years of service, including World War I, Nicaragua, World War II in the Pacific, and Korea. Known for his bravery and leading from the front, Puller was awarded 5 Navy Crosses, second only to the Medal of Honor in significance.