Question: Who was John Nord's wrestling trainer?

Context articles: Bert Ruby
Sara Del Rey
Verne Gagne
John Nord
Matt Bloom
Pirata Morgan
Eddie Sharkey
Kafu
Boris Malenko
Paul Orndorff

Bert Ruby (November 1910 - March 1968) was a professional wrestler, wrestling trainer, and wrestling promoter.
 During his athletic career in Detroit, Ruby earned the title of "Jewish sensational light heavyweight champion".
 He is recognized for hosting the TV program, Motor City Wrestling, as well as being a key player in the promotion of midget wrestling.
Sara Amato (born November 13, 1980) is an American professional wrestling trainer and retired professional wrestler best known by her ring name Sara Del Rey.
 She was a mainstay for Chikara and Shimmer, but also appeared for many other independent promotions in the United States, including Ring of Honor (ROH), IWA Mid-South and All Pro Wrestling, as well as Mexico's Lucha Libre Femenil.
 Del Rey also taped several matches, competing under a mask and using the name Nic Grimes, for the MTV promotion Wrestling Society X.
 Del Rey was the inaugural Shimmer Champion and co-holder of the Shimmer Tag Team Championship with Courtney Rush, making her the promotion's first double champion.
 In 2012, Del Rey became only the fourth woman to make it to Pro Wrestling Illustrated's list of top 500 wrestlers in the world.
 She is currently employed by World Wrestling Entertainment (WWE) as the Assistant Head Coach and producer of their developmental territory NXT, based at the WWE Performance Center.
Laverne Clarence Gagne ( ; February 26, 1926 – April 27, 2015) was an American professional wrestler, football player, wrestling trainer, and wrestling promoter.
 He was the owner and promoter of the Minneapolis-based American Wrestling Association (AWA), the predominant promotion throughout the Midwest and Manitoba for many years.
 He remained in this position until 1991, when the company folded.
John Nord (born October 18, 1959) is an American retired professional wrestler.
 He is best known for his appearances with the American Wrestling Association and World Class Championship Wrestling in the 1980s as Nord the Barbarian and Yukon John and with the World Wrestling Federation, All Japan Pro Wrestling and World Championship Wrestling in the 1990s as The Berzerker and under his birth name.
Matthew Jason Bloom (born November 14, 1972) is an American professional wrestling trainer, color commentator and retired professional wrestler and National Football League player.
 He is currently employed by the professional wrestling promotion WWE, where he is the head trainer at the WWE Performance Center in Orlando, Florida.
Pedro Ortiz Villanueva (born July 29, 1962) is a Mexican professional wrestler, or luchador, and wrestling trainer who is best known under the ring name Pirata Morgan.
 Ortiz made his professional wrestling debut in 1979 and has in the last 20 years worked for Consejo Mundial de Lucha Libre (CMLL), Asistencia Asesoría y Administración (AAA), International Wrestling Revolution Group (IWRG) and is active on the Mexican Independent circuit, having left AAA in early 2009 after working for the company for over 10 years.
 Ortiz's ring name comes from the name of Captain Henry Morgan, a 16th-century Pirate noted for his cruelty.
Eddie Sharkey (born October 29, 1936) is an American professional wrestling trainer.
 He is often called "The Trainer of Champions" or "The Trainer of Legends" , and has been instrumental in training some of the biggest names in the sport, including The Road Warriors (Hawk and Animal), "Ravishing" Rick Rude, Tom Zenk, Bob Backlund, Jerry Lynn, Sean Waltman, Nord the Barbarian, Barry "Demolition Smash" Darsow, Rick Steiner, Madusa, Jesse "The Body" Ventura, Austin Aries and Erick Rowan.
Victor Ceron (born on August 27, 1978) is a Brazilian retired professional wrestler, Currently an wrestling Trainer for independent companies in San Jose, California promotions.
 better known under his ring name, Kafu.
 Kafu has worked for All Pro Wrestling (APW), Inoki Dojo, International Wrestling Association, Big Time Wrestling, LLX (Mexico) World 1, PCW, NWA Pro, Portugal Wrestling, and the WWE development territory Florida Championship Wrestling.
 He has wrestled many well-known wrestlers, including Steve Corino, Jim Neidhart, Raven, Daniel Bryan, Savio Vega and The Sandman.
Lawrence "Larry" J. Simon (June 28, 1933 – September 1, 1994), better known by the ring name, Boris Malenko, was an American professional wrestler and professional wrestling trainer.
 He is best known for his appearances with Championship Wrestling from Florida and Big Time Wrestling in the 1960s and 1970s as a Russian heel.
 He is the father of professional wrestlers Joe Malenko and Dean Malenko.
Paul Parlette Orndorff Jr. (born October 29, 1949) is an American former professional wrestler, best known for his appearances with the World Wrestling Federation (WWF) and World Championship Wrestling (WCW) as "Mr. Wonderful" Paul Orndorff.
 Orndorff became a star in the 1980s WWF wrestling boom.
 Orndorff's feud with Hulk Hogan in 1985–1986 is a highlight of his career.
 Orndorff departed the WWF for WCW in early 1988.
 After retiring, Orndorff worked as a professional wrestling trainer.
 In 2011, Orndorff was diagnosed with cancer, but went through treatment and was declared cancer free by the end of 2011.