Harry Markos is a security professional with over 35 years of public and private sector professional security experience, specialising in the fields of counter terrorism, surveillance, data protection and intelligence.

He served with the Metropolitan Police service for 30 years, specialising for 27 years. This includes 14 years as a Special Branch/SO15 Counter Terrorism Command officer. Since retiring from a successful police career, Harry formed his security solutions company Lionheart Solutions, which he runs with his partners with similar knowledge and experience in the public and private sectors.