Charles focuses on electrical, electronic, software, mechanical, and business method patent matters. He also has extensive experience in trademark, copyright, and e-commerce matters, including prosecution, counseling, and licensing.

After receiving his engineering degree from the University of Maryland, Charles worked for four years as an electronics engineer for the US Navy. While attending law school at American University, he was a Patent Examiner in the US Patent and Trademark Office. After graduating from law school, Charles entered private practice.

Charles is a former adjunct professor at the Capital Institute of Technology and instructor at Patent Resources Group. He currently holds membership in the International Trademark Association (INTA), American Intellectual Property Law Association (AIPLA), and American Bar Association (ABA).

Charles is an author and contributing editor of Worldwide Trademark Transfers: Law and Practice.