Played by Anthony Heald

Judge Harvey Cooper first appeared when he presided over the "Black Widow" trial in the episodes 2x01 [The Black Widow] and 2x02 [Schadenfreude]. In that trial, he displayed his reputation as a non-nonsense judge by handing Alan Shore a quadruple sentence for contempt. Later, he was the judge in the trial of Ronald Jessel, the child murder defendant whom Denny Crane shot in the knee in 2x07 [Truly, Madly, Deeply]. In that trial, he famously ordered Garrett Wells to hop out of the courtroom on one foot. In Season 3, Cooper returned as the judge in the Scott Little murder trial.

Judge Cooper's most identifiable characteristic is his eccentric pronunciation of "Massachusetts".

Anthony Heald
Anthony Heald is probably best-known for his role as Scott Guber, the stern vice principal with a heart of gold, in another David E. Kelley series, Boston Public. Previously, he appeared as Los Angeles-based Judge Wallace Cooper in three episodes of The Practice. He also appeared on The Practice as Principal Guber in a cross-over episode with Boston Public characters.
It has been of some contention amongst Boston Legal fans if the character that Anthony Heald is playing as Judge Harvey Cooper is the same Judge that he played on The Practice. On The Practice his name was Judge Wallace Cooper and he had the same eccentric pronunciation of "Massachusetts" It is obvious by way he acts it is the same character but the name change remains baffling.
Anthony Heald inat the Internet Movie Database.

Episode appearances:
2x01 [The Black Widow]
2x02 [Schadenfreude]
2x07 [Truly, Madly, Deeply]
3x02 [New Kids On The Block]
3x03 [Desperately Seeking Shirley]
3x05 [Whose God Is It Anyway?]
3x06 [The Verdict]