Martin Haar is a retired football defender from the Netherlands

Netherlands

The Netherlands is a constituent country of the Kingdom of the Netherlands, located mainly in North-West Europe and with several islands in the Caribbean. Mainland Netherlands borders the North Sea to the north and west, Belgium to the south, and Germany to the east, and shares maritime borders...

, who is the current serving as assistant coach at AZ Alkmaar. He played for Go Ahead Eagles

Go Ahead Eagles

The Go Ahead Eagles are a football club from Deventer, Netherlands, currently playing in the Eerste Divisie. The club's home stadium is De Adelaarshorst. To date, the club has won the national championship four times...

 (1971–1977), HFC Haarlem

HFC Haarlem

HFC Haarlem was a Dutch football club from the city of Haarlem, established in 1889. The club won the Dutch national title in 1946 and reached five Cup finals, winning in 1902 and 1912...

 (1977–1983), AZ '67 (1983–1986), HFC Haarlem (1986–1988), Sparta Rotterdam

Sparta Rotterdam

Sparta Rotterdam is the oldest professional football team in the Netherlands, established on April 1, 1888. Sparta is one of three professional football clubs from Rotterdam, the others being Excelsior and Feyenoord , the latter playing in the Eredivisie.-History:Sparta was first founded in 1887....

 (1988–1989) and FC Wageningen

FC Wageningen

FC Wageningen was a Dutch football club which was founded on August 27, 1911. The club played its matches in the Wageningse Berg stadium ....

 (1989). He was a member of the famous Haarlem team, that competed in the UEFA Cup

UEFA Cup

The UEFA Europa League is an annual association football cup competition organised by UEFA since 1971 for eligible European football clubs. It is the second most prestigious European club football contest after the UEFA Champions League...

 in the 1982-1983 season, for the first time in the club's history. However this campaign was to be overshadowed by the Luzhniki Disaster

Luzhniki disaster

The Luzhniki disaster was a deadly human crush that took place at Lenin stadium in Moscow, Soviet Union during the UEFA Cup second round match between FC Spartak Moscow and HFC Haarlem on 20 October 1982. The official death toll to this day is 67, although many claim it to be as high as 340...

.

Since then, he served as assistant coach to Louis van Gaal

Louis van Gaal

Aloysius Paulus Maria "Louis" van Gaal OON is a Dutch football manager formerly in charge of Ajax, Netherlands, Barcelona, AZ and Bayern Munich...

 during the successful 2008–09 Eredivisie campaign of AZ, that ended in the second Dutch champions title for the Alkmaar club. He was confirmed also in the 2009–10 season under new trainer Ronald Koeman

Ronald Koeman

Ronald Koeman is a former Dutch footballer, and the current manager of Feyenoord. He is the younger brother of former Feyenoord coach Erwin Koeman and the son of former Dutch international Martin Koeman...

, after van Gaal left AZ to join FC Bayern Munich

FC Bayern Munich

FC Bayern Munich , is a German sports club based in Munich, Bavaria. It is best known for its professional football team, which is the most successful football club in Germany, having won 22 national titles and 15 cups....

, and briefly served as caretaker manager after Koeman was fired in December 2009.