Title: John Clark Jr.
Content:  John Clark Jr. is a fictional character in the television series NYPD Blue. He was played by Mark-Paul Gosselaar for four years, from season 9 until the end of the series. Clark Jr. was partnered with the rough but friendly detective Andy Sipowicz after Sipowicz's previous partner, Danny Sorenson, was murdered in an undercover sting gone bad. Clark earned his detective badge after courageous action in an undercover operation. Sipowicz became a kind of mentor for the young detective, and much of the veteran detective's skill rubbed off on Clark. His father, Clark Sr., was a by-the-book but not very competent detective who disapproved of his 
Title: John Kelly (NYPD Blue)
Content: 1958 - Born in New York ; 1969 - Father killed in action ; 1979 - Joins police force; after completing the academy, first assignment is in Public Morals unit ; Early 1980s - Performs regular uniformed police work ; Mid-80s: Marries Laura ; 1986 - Becomes a detective, partnered with Andy Sipowicz ; 1993 - Finalizes divorce from Laura ; 1994 - Forced early retirement John Bradley Kelly Jr. is a fictional character and the original protagonist in the television series NYPD Blue, portrayed by David Caruso. The character appeared in the first season and the first four episodes of the second season. In the first season, Kelly says he has been 
Title: NYPD Blue
Content:  used the 9th Precinct building on East 5th Street in New York City, also used for Kojak.  The show was initially a vehicle for David Caruso. John Kelly was the main character, and the first season revolved around him and his professional and personal lives. Promotional shots for the show depicted Caruso in the foreground and other first-season characters set off behind him. Season two had the departure of John Kelly, and the show was thereafter built around an ensemble cast. Dennis Franz, as Andy Sipowicz, a veteran New York City Police detective, evolved into the show's lead character, who increasingly assumed a mentorship role to other characters as the series progressed. His co-stars included (season two and beyond) Jimmy Smits as Det. Bobby Simone (1994–1998), Rick Schroder as Det. Danny Sorenson (1998–2001), and Mark-Paul Gosselaar as Det. John Clark, Jr. (2001–2005).
Title: Bill Clark (screenwriter)
Content: NYPD Blue (Writer, Executive Producer, technical advisor) (1993–2005) ; Brooklyn South (Supervising Producer) (1997) ; Blind Justice (Executive Producer) (2005) ; John From Cincinnati (Consulting Producer) (2007)  He has had featured acting roles on LA Law, John From Cincinnati, Fallen, CSI: Miami and NYPD Blue. Clark appeared on the Charlie Rose Show in 1995 along with David Milch. Activision consulted with Clark on their 2005 release True Crime: New York City.
Title: List of NYPD Blue characters
Content:  lies about his involvement in the Vietnam War and his exposure of informant Ferdinand Hollie, who was murdered as a result. He later appeared during a case that involved Fancy's foster son Maceo being caught while transporting heroin; Maceo agreed to become an informant, and made a controlled delivery that enabled Kahlins's task force to arrest the drug gang for whom Maceo had been working. Played by Daniel von Bargen. ; Det. John Clark Sr. — John Clark Jr.'s father. An average detective from a low crime precinct mutually despised by Sipowicz, who called him "Dutch Boy" in reference to a 
Title: True Crime: New York City
Content:  an image of the Manhattan skyline appearing as the site's wallpaper. In August, IGN published an interview with former NYPD detective Bill Clark, who had previously served as executive producer and technical advisor of NYPD Blue, and was now working as head technical advisor for True Crime: New York City. Clarke has been with the NYPD for twenty-five years, seventeen in homicide. During his time on the force, he was involved in such major cases as the Son of Sam investigation, and the collapse of several of the "Five Families". Of his involvement with the game, Clarke stated "Activision approached me because it 
Title: NYPD Blue (season 9)
Content: Dennis Franz as Andy Sipowicz ; Mark-Paul Gosselaar as John Clark, Jr. ; Gordon Clapp as Greg Medavoy ; Henry Simmons as Baldwin Jones ; Charlotte Ross as Connie McDowell ; Bill Brochtrup as John Irvin ; Garcelle Beauvais Nilon as Valerie Haywood ; Esai Morales as Tony Rodriguez ; Jacqueline Obradors as Rita Ortiz (episodes 8-22) 
Title: List of NYPD Blue characters
Content:  mostly in cases where the detectives suspected that uniform cops had done something wrong. He was afraid that he would be forced out of the department after he cleared Clark Jr.'s name by admitting knowledge of Laughlin's attempt to frame Clark Jr., but subsequent appearances showed he remained on the job, and was a well-regarded officer at the 15th. Played by James Luca McBride. ; Officer Miller — In addition to Shannon, one of the uniformed officers most likely to be in charge of a crime scene when detectives arrived. Played by Billy Concha. ; Josh Astrachan & N.D. "Hank" Harold 
Title: NYPD Blue (season 1)
Content:  John Kelly and Andy Sipowicz are detectives in the 15th squad. Sipowicz is the elder partner but is a drunk and a threat to the partnership lasting much longer. Kelly has a genuine affection for his partner but becomes increasingly exasperated by Sipowicz's behavior. In the pilot, Sipowicz is shot, and nearly killed, by Alphonse Giardella, a gangster whom Sipowicz, while drunk, insulted badly in public. This leads to his decision to stay sober (after involuntarily drying out while in a coma) and save his job. While his partner is recuperating, Kelly is teamed up by the squad's Lieutenant, Arthur Fancy, with a young cop from Anti-Crime, James Martinez. 
Title: NYPD Blue
Content:  The fourth and final phase of the show took place over the final four seasons. Season nine initially tied-in with the September 11 terrorist attacks. In the "Sorenson missing" storyline, continuing from the previous season, a suspect trades immunity for a robbery and shooting in exchange for information on a buried rug in Brooklyn that turns out to contain Sorenson's dead body. Assisting on the investigation is Officer John Clark Jr., played by Mark-Paul Gosselaar. He is promoted to detective third grade for his heroic actions in the shootout that ended with the death of the hitman who had murdered Danny and an undercover federal agent; Sipowicz is promoted 

Question: who played john clark sr on nypd blue?
Answer: Joe Spano.