Private company

Heinz Sielmann Stiftung

Logo: Heinz Sielmann Stiftung, Public domain, via Wikimedia Commons4

Non-profit organization in Germany

The Heinz Sielmann Foundation (de:Heinz Sielmann Stiftung) is a charitable organization based in Duderstadt, Germany. The organization has the official motto "Diversity is our nature" and it introduces people, especially children and young people, to a positive approach towards nature through its programs involving interpersonal experiences. It also spreads public awareness about nature and its need for protection and carries out the preservation of the Heinz Sielmann archive of nature photographs/films.2 It employed 98 people in 2024.1 Its revenue was €13.8 million in 2024.1 Wikipedia text CC BY-SA 4.0

Last updated Oct 21, 2026.

Overview

Jun 2, 1994Founded1
  • Industryenvironment1
  • HeadquartersDuderstadt, Germany1
  • Websitewww.sielmann-stiftung.de
  • Legal formprivate foundation1
  • Kind of organizationFoundation1
  • LEI529900NB903K1AN4Z3583
  • StatusActive3
  • LEI statusIssued and current3
  • Registered addressn.a., 80331 München, Germany3
  • Registered withBavarian State Office of Statistics3
Gut Herbigshagen
Photo: Lupus666, CC BY-SA 3.0, via Wikimedia Commons6

The Heinz Sielmann Foundation (de:Heinz Sielmann Stiftung) is a charitable organization based in Duderstadt, Germany. The organization has the official motto "Diversity is our nature" and it introduces people, especially children and young people, to a positive approach towards nature through its programs involving interpersonal experiences. It also spreads public awareness about nature and its need for protection and carries out the preservation of the Heinz Sielmann archive of nature photographs/films.2

The story

Founded by Heinz Sielmann and Inge Sielmann on Jun 2, 1994.1

The organization started its journey in 1996 at a property located at Herbigshagen, near the town of Eichsfeld, Duderstadt in Lower Saxony. It acquired the property in 2003. From the early days, the organizations imparts lessons to the school students in the State of Lower Saxony, working as the Regional Environmental Education Center. Its nature adventure house was reopened in 2019 where the exhibition "Diversity needs diversity" exhibited the visitors, the complex interrelationships of nature with the help of mosaic flaps and a media installation. A separate exhibition has been arranged under the title "Heinz Sielmann: A life in a film". The classics and awards of Heinz Sielmann are shown in a separate trophy room. On the northern part of the estate is the Franz von Assisi chapel, in which the urn of the foundation's founder Heinz Sielmann was buried in 2006 and his wife Inge in 2019.

From Wikipedia’s article on The Heinz Sielmann Foundation, shared under CC BY-SA 4.0.5

Leadership

Who has led Heinz Sielmann Stiftung, and when. Pick a name to see everywhere that person has worked.

Employees over time

Heinz Sielmann Stiftung employees by year198 in 2024+88% since 2017
02550751002017: 525220172018: 60602018+15%2019: 59592019−2%2020: 64642020+8%2021: 64642021+0%2022: 95952022+48%2023: 96962023+1%2024: 98982024+2%
  • 2024981
  • 2023961
  • 2022951
  • 2021641
  • 2020641
  • 2019591
  • 2018601
  • 2017521

Revenue over time

As stated on Wikidata, in the currency reported.

Revenue

Heinz Sielmann Stiftung revenue by year113.8M EUR in 2024+53% since 2015
05.0M EUR10.0M EUR15.0M EUR20.0M EUR2015: 9.0M EUR9.0M EUR20152016: 9.3M EUR9.3M EUR2016+4%2017: 15.2M EUR15.2M EUR2017+64%2018: 11.5M EUR11.5M EUR2018−25%2019: 13.6M EUR13.6M EUR2019+19%2020: 13.5M EUR13.5M EUR2020−1%2021: 12.1M EUR12.1M EUR2021−10%2022: 18.4M EUR18.4M EUR2022+51%2023: 12.8M EUR12.8M EUR2023−30%2024: 13.8M EUR13.8M EUR2024+8%
  • 202413.8M EUR1
  • 202312.8M EUR1
  • 202218.4M EUR1
  • 202112.1M EUR1
  • 202013.5M EUR1
  • 201913.6M EUR1

Timeline

  1. Jun 2, 1994Founded Founded1