He made his Broadway-theatre début in New York City, New York, originating the role of Henrik Egerman in the musical-theatre production of A Little Night Music (1973–1974) with music and lyrics by Stephen Sondheim and book by Hugh Wheeler.
Lambert has also appeared in over ten films and over thirty-five television productions.
He dubbed the singing voice for "Tomorrow Belongs to Me" in the musical film Cabaret (1972), although the screen role was played by Oliver Collignon, a young German extra; Lambert's voice was uncredited.
|1972||Cabaret||singing voice dubbing; uncredited||musical film|
|2006||The Tiger's Tail||District Judge||comedy-drama; thriller|
|2009||Savage||Garda Superintendent (voice)||thriller|
|1984||Caught in a Free State||Sean McGlynn||drama||miniseries; all four episodes|
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