The actors that have the most appearances is their roles in all Law and Order series are:
Note: Munch appeared in more episodes of the original Law and Order series (plus 122 episodes of Homicide: Life On The Street, not counted in these totals) than Olivia. The next five runners up are:
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McCoy
Actor Jerry Orbach played Det. Lenny Briscoe in 274 episode of the original Law and Order series; 3 episodes of Law and Order SVU; 1 episodes of Law and Order Criminal Intent; 3 episodes of Homicide: Life on the Street; 2 eipsodes of Law and Order: Trial by Jury; and 3 Law and Order video games.
Actor John Tesh has no credits for any of the Law and Order series.
Actor Ally Walker played Dr. Stanton on the Law and Order SVU.
The actor in the Comcast Xfinity commercial is Dennis Farina, who played Detective Joe Fontana on the original Law and Order series.
Kathryn Erbe played Detective Alexandra Eames on Law & Order: Criminal Intent.
None of the main cast of Law and Order: CI was an actor by the name of Dan. One of the lead characters on Law and Order: SVU was played by actor Dann Florek as Captain Donald Cragen (331 episodes).
Actor Thomas Dale has no credits for any of the Law and Order series.
Actor Jerry Orbach played Det. Lenny Briscoe in 274 episode of the original Law and Order series; 3 episodes of Law and Order SVU; 1 episodes of Law and Order Criminal Intent; 3 episodes of Homicide: Life on the Street; 2 eipsodes of Law and Order: Trial by Jury; and 3 Law and Order video games.
Actor John Tesh has no credits for any of the Law and Order series.
Since about 1987
Actor Ally Walker played Dr. Stanton on the Law and Order SVU.
The actor in the Comcast Xfinity commercial is Dennis Farina, who played Detective Joe Fontana on the original Law and Order series.
I thought he was good in Law and Order.
Kathryn Erbe played Detective Alexandra Eames on Law & Order: Criminal Intent.
Actor Jerry Mathers has no roles listed for any of the Law and Order series.
In the original Law and Order series 1990-2010 (456 episodes) the the guest actor with the most appearances is actor David Lipman who appeared as Judge Arthur Cohen in 27 episodes. David Lipman also appeared as Judge Morris Torledsky in 13 episodes of Law and Order SVU, and one episode of Law and Order: Trial by Jury.The runner up is actor John Cariani who appeared as CSU Julian Beck in 26 episodes. John Cariani also appeared in two episodes of Law and Order: CI as 'Perry' and as 'Frank'.
The actor's name is Steven Zirnkilton; he did the intros for all of the Law and Order shows. His website is on the link below.