Question: What year was Urby Emanuelson's manager at Ajax Youth Academy born?

Context articles: Florian Jozefzoon
Jorge Zárate
Ajax Hellas Youth Academy
Ajax Youth Academy
Martin Jol
John Heitinga
Julian Emanuelson
Nigel de Jong
Patrick Zwaanswijk
Urby Emanuelson

Florian Marc Jozefzoon (born 9 February 1991) is a Dutch professional footballer who plays as a winger for English club Brentford.
 He is a product of the Ajax Youth Academy and won 10 caps for the Netherlands at youth level.
Zárate joined Pubelas youth academy in 2008.
 He continued through Puebla's Youth Academy successfully going through U-17 and U-20.
 Until finally reaching the first team, José Luis Sánchez Solá being the coach promoting Zárate to first team.
 Zárate also later forming part of Chiapas F.C. Youth Academy in 2012 and Morelia Youth Academy in 2013.
Ajax Hellas Youth Academy or Ajax Hellas for short is a football youth academy based in Corfu, Greece, from where the organization manages a total of 15 clubs throughout Greece and Cyprus.
 The academy was established in 2011 by Dutch footballing giants Ajax Amsterdam.
The Ajax Youth Academy is a football youth academy based in Amsterdam, Netherlands, from where the organization manages a total of 13 youth teams (ages 7–18).
 The academy is the primary youth clinic of Dutch footballing giants Ajax Amsterdam.
Maarten Cornelis "Martin" Jol (born 16 January 1956) is a Dutch football manager and former midfielder.
John Gijsbert Alan "Johnny" Heitinga (born 15 November 1983) is a Dutch football coach and a former player who played as a centre back.
 He manages the Under-19 squad of Ajax.
 A product of the Ajax Youth Academy, he played for their first squad from 2001 to 2008.
 After a one-year spell at Atlético Madrid in Spain, he signed for Everton in 2009.
 Joining Fulham for six months in January 2014, he then signed with German side Hertha BSC the following Summer, signing a two-year deal with the club from Berlin.
 In June 2015 he returned to his first club Ajax.
Julian Emanuelson (born 2 June 1977) is a Surinamese-Dutch retired professional footballer.
 As a product of the Ajax Youth Academy, he spent most of his career playing as a midfielder for Dutch club Haarlem.
 He also played for Holland Sport, FC Lisse, FC Türkiyemspor in the Netherlands, and for FC Lustenau 07 in Austria.
Nigel de Jong (] ; born 30 November 1984) is a Dutch professional footballer who plays as a defensive midfielder for Turkish club Galatasaray and the Netherlands national team.
 He joined the Ajax youth academy as a youngster and worked his way through the ranks to make the first team at age 17.
 Two years later, in 2004, he made his international debut.
 Additionally, in 2010 he won a World Cup runners-up medal.
Patrick Zwaanswijk (born 17 January 1975) is a semi-professional Dutch footballer who currently plays for and captains Southern & Ettalong United in Australia's Central Coast Premier League.
 A product of the Ajax Youth Academy, Zwaanswijk retired from professional football in 2013 following stints with FC Utrecht, Oita Trinita, NAC Breda and Central Coast Mariners FC.
 He has played predominantly as a central defender throughout his career.
Urby Vitorrio Diego Emanuelson (born 16 June 1986) is a Dutch professional footballer of Surinamese descent who plays for Eredivisie side FC Utrecht and the Netherlands national team.
 As a product of the Ajax Youth Academy, he spent most of his career at Ajax playing as a left wing-back, before being played more as a left midfielder or left winger by manager Martin Jol.
 After his move to Milan, his then-manager Massimiliano Allegri played Emanuelson also as an attacking midfielder, midfielder and right winger.