William Marcus Charles II (Marc) is the author of Simplified Self-defense for Women, published by the Marine Corps Association. He has been published in The Marine Corps Gazette and in the Ensign, a global monthly of the LDS Church.

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Born in Murfreesboro, Tennessee, Marc spent his formative years in Warren, Michigan. He graduated from boot camp in San Diego at nineteen and for the next twenty-four years wore the Eagle, Globe, and Anchor proudly until retirement as a Lieutenant Colonel of Marines. He has served as an Infantry Rifle Company Executive and Commanding Officer; Company Commander in a Recruit Training Regiment; Commanding Officer of the Marine Detachment USS Midway; Commanding Officer of Company C, Marine Security Guard Battalion; War Planner—US Naval Forces Central Command; and Executive Officer, Marine Barracks, Pearl Harbor. He is a graduate of the US Army Psychological Warfare Course, the US Army Infantry School, and the Marine Corps Command and Staff College.

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Marc  spent much of his military career in Asia where he studied martial arts. He is a Roku-dan (sixth degree black belt) in Okinawan Kenpo Karate and a Roku-dan in Kobudo (the weapons of Okinawa). He has trained in Aikido, Jujitsu, American Kenpo, Shorinryu, Judo and other lesser known styles. He has founded three martial arts schools in the United States.

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Marc graduated with honors from Park College with a BS in Management and Finance and has an MBA from National University.

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He currently resides in Encinitas, California, with his loving wife Sako.