The Hamburglar was voiced by actor and comedian Charlie Adler in later animated McDonald's advertising.
The Hamburglar is one of McDonald's most recognizable McDonaldland characters. He was originally portrayed as a small, mischievous figure obsessed with stealing hamburgers, but later redesigns made him younger-looking and more cartoon-like. His striped clothing, cape, and exaggerated speech helped distinguish him from the rest of the cast.
Charlie Adler is known for extensive voice work in animation and voiced the Hamburglar during a later period of the character's use. Different performers portrayed or voiced McDonaldland characters across decades, so a single performer should not automatically be assumed to represent the entire history of a character.
The Hamburglar's role was a fictional advertising device rather than a statement about restaurant security. His recurring attempts to grab hamburgers created simple comic situations that could be understood by children in many countries.