Jostein Einar Erstad was a Norwegian jurist.

He was born in Skodje

Skodje

Skodje is a municipality in Møre og Romsdal county, Norway. It is part of the Sunnmøre region. The administrative centre is of the municipality is the village of Skodje...

. He was a police superintendent in Oslo

Oslo

Oslo is a municipality, as well as the capital and most populous city in Norway. As a municipality , it was established on 1 January 1838. Founded around 1048 by King Harald III of Norway, the city was largely destroyed by fire in 1624. The city was moved under the reign of Denmark–Norway's King...

 from 1962 to 1966, teacher at the Norwegian Police Academy

Norwegian Police University College

The Norwegian Police University College is a public university college located in Oslo, Kongsvinger, Stavern and Bodø, Norway. It offers education for the police force of Norway, including a three-year basic education and a possible expansion with a Master's degree. 720 students are accepted at...

 from 1966 to 1971, public prosecutor in Eidsivating Court of Appeal

Eidsivating Court of Appeal

Eidsivating Court of Appeal is the court of appeal located in Hamar, Norway. It serves the counties of Hedmark, Oppland and northern Akershus. In addition to Hamar, the court may meet in Lillehammer and Eidsvoll...

 from 1971 to 1981, chief public prosecutor from 1981 to 1982 and director of the Norwegian Police Surveillance Agency from 1982 to 1990. The Arne Treholt

Arne Treholt

Arne Treholt is a former Norwegian Labour Party politician and diplomat convicted of high treason and espionage on behalf of the Soviet Union and Iraq during the Cold War. Treholt's espionage is generally seen as the most serious spy case in the modern history of Norway...

case happened during his directorship.

He died in July 2011.