Adam was born in New York City and grew up a normal kid going to school at PS183. When he was 7, he auditioned and won the part in an American Express commercial. The rush of acting got him hooked. As a boy, he made small parts in moves I'm Not Rappaport and Radiant City. His first big role occurred in the Disney Channel's show, Lizzie McGuire, where he costars with Hilary Duff and Lalaine.

He intends to go to college maybe a year or two later than usual to study humanities. He loves living in NYC, but is obliged to work in LA since that is where Lizzie McGuire is shot.
Born on the exact same day as Jake M. Smith from Holes. He is a fan of Kevin Spacey. He is a junior at Berkeley University in California as of 2005. Of the three main stars of Lizzie McGuire (the others being Hilary Duff and Lalaine), he is the only one who has never released a music album. His favourite TV show is The Simpsons. His favourite films are A Clockwork Orange, The Usual Suspects and the "Godfather" trilogy (The Godfather, The Godfather: Part II and The Godfather: Part III). Sometimes plays basketball with Even Stevens star Shia LaBeouf. His last name originated from his great-grandfather who emigrated to America from Poland in the early 20th century. At Immigration, he misunderstood the officer when he was asked for his last name; he thought they wanted where he was from and said "Lamberg". Like his Lizzie McGuire character David "Gordo" Gordon, he is interested in becoming a director. His favourite sports are tennis and basketball. He is an only child. His parents' names are Marc and Suzanne Lamberg. Enjoys being in Broadway shows because he likes the feeling of a live audience. Was born the day before Prince Harry Windsor. Is the oldest of the three main Lizzie McGuire actors, being 3 years older than LaLaine and Hilary Duff. Is also three years older than his character, David 'Gordo' Gordon