Question: Frans Hoek was an assistant to with Dutch  football manager who won 20 major honours in his managerial career?

Context paragraphs:
Glenn Roeder: Glenn Victor Roeder (born 13 December 1955 in Woodford, Essex) is an English football manager and former player.  He is a managerial assistant at Stevenage.  As a player, Roeder represented England B on seven occasions.  A defender, he played club football for Leyton Orient, Queens Park Rangers, Notts County, Newcastle United, Watford and Gillingham.  His managerial career included spells with Gillingham, Watford, West Ham United, Newcastle United and Norwich City.

List of Zob Ahan F.C. managers: The following is a list of managers of Zob Ahan Football Club and their major honours from the beginning of the club's official managerial records from 1969 to the present day.  The first manager of the club was Rasoul Madadnoei.  The current manager is Amir Ghalenoei since 10 June 2017.

List of Rah Ahan F.C. managers: The following is a list of managers of Rah Ahan and their major honours from the beginning of the club's official managerial records from 1937 to the present day.  The first manager of the club was Rasoul Madadnoei.  The current manager is Hamid Estili since 26 June 2014.

Wim de Bois: Cornelis Hendrik Willem de Bois (19 June 1896 – 1 August 1975) is a former Dutch football manager and player who played for AFC Ajax in the Netherlands.  During his managerial career he managed the Dutch Guyana national team ("now known as Suriname"), DFC, DOS, RBC, Go Ahead, SC Veendam, VV Oldenzaal, Quick '20 and Tubantia.

Louis van Gaal: Aloysius Paulus Maria "Louis" van Gaal, (] ; born 8 August 1951) is a Dutch football manager and former player.  He was formerly manager of Ajax, Barcelona, AZ, Bayern Munich, the Netherlands and Manchester United.  He is one of the most decorated managers in world football, having won 20 major honours in his managerial career.

List of IFK Göteborg managers: The following is a list of managers of IFK Göteborg, with their league match record and major honours.  Including the current manager Alf Westerberg, IFK Göteborg have had 32 managers or caretaker-managers during 40 managerial spells, excluding the first 16 years of the club's history when there was no official manager.  The longest-serving manager is Henning Svensson, who made three spells at the club for a total of 8½ seasons.

List of Leeds Rhinos head coaches: The following is a list of managers of Leeds Rhinos Rugby League Football Club and their major honours from the beginning of the club's official managerial records in 1936 to the present day.  Each manager's entry includes the dates of his tenure and honours won while under his care.  As of 2011 Leeds Rhinos have had 21 full-time coaches.

List of Leeds United F.C. managers: The following is a list of managers of Leeds United Association Football Club and their major honours from the beginning of the club's official managerial records in 1919 to the present day.  Each manager's entry includes the dates of his tenure and the club's overall competitive record (in terms of matches won, drawn and lost) and honours won while under his care.  As of 15th June 2017, Leeds United have had 35 full-time managers.  There have also been 9 caretaker managers, 3 of whom had previously occupied the role on a full-time basis, and one of whom has occupied the role three times.

Frans Hoek: Frans Hoek (] ; born 17 October 1956) is a Dutch football coach and former player.  As a player, he was a goalkeeper for FC Volendam for more than a decade, before going into coaching as an assistant to Louis van Gaal at club sides AFC Ajax, FC Barcelona, FC Bayern Munich and Manchester United, and the Netherlands national team.  He also worked for the Poland national team under fellow Dutchman Leo Beenhakker.  He has worked with goalkeepers including Edwin van der Sar, Stanley Menzo, Víctor Valdés, Vítor Baía, Pepe Reina, Robert Enke, Łukasz Fabiański, Thomas Kraft, Michel Vorm and David de Gea.  Hoek is widely regarded as one of world football's foremost goalkeeping mentors.

Ron Gray (footballer): Ron Gray (25 June 1920 – 11 October 2002) is a former association football player, manager and scout.  Born in North Shields, wing half Gray started his professional year in 1938 with Sheffield United, later moving to Lincoln City, Notts County and finally Watford, before retiring at the age of 26 due to injury.  He started his managerial career at Watford, but his tenure was not particularly successful.  The club recorded their lowest ever football league finish, having to apply for re-election to the Football League in 1950–51.  His next managerial role was at Millwall.  After his first spell as manager, Gray stayed at the club as assistant manager to Reg Smith.  Gray was re-appointed as manager after Smith was sacked, and led the club to promotion as Fourth Division champions in 1961–62.  Gray later spent four seasons at Lincoln City from 1966 to 1970, when he signed future Watford manager Graham Taylor as a player.  After leaving Lincoln, Gray joined Ipswich Town as a scout, where he remained until his retirement in 1987.  and discovered many of the 1978 FA Cup and 1981 UEFA Cup winning team's under the management of Bobby Robson.

Supporting paragraphs: Frans Hoek Louis van Gaal
Answer: Louis van Gaal