Barry Donadio led an honorable career in the Volunteer Ambulance Service, Volunteer Fire Department, the Military, Law Enforcement, and the United States    Secret Service.

Donadio served at the White House during the Bush and Obama Administrations. He also served the People of the United States of America by voluntarily deploying to multiple Middle Eastern war zones during his career. He has over 20 years of public service experience. In 2013, he published his book " TWA Flight 800 First Responder Witness Account". This is his account describing what he observed and his actions during the rescue of TWA Flight 800 July 1996.

In 2014 he was elected to the Queen Anne's County Republican Central Committee in Maryland. He currently serves as President of Public Security LLC, which is a high profile American private security and investigation firm licensed in Maryland and New York. His firm serves many Politicians, VIPs and other clients with a risk to their personal security. In January 2017, he was appointed the Sergeant At Arms of the Maryland Republican Party.

In 2020, Donadio continues to serve the People of the United States as the Sergeant of Arms of the Maryland Republican Party.