was born in Austria and studied architecture in Vienna, where many of his passions were born. He was twelve when Led Zeppelin's first LP was released. Gregor was thirteen when Neil Armstrong and Buzz Aldrin walked on the moon. 
When Gregor saw the science fiction film Blade Runner for the first time, he was 26 years old.

Gregor was a professor of architecture at the ETH in Zurich, Switzerland. He also taught as a professor at the Academy of Fine Arts in Munich and at the University of Applied Arts in Vienna.

From 1984 to 2005, he ran an architecture firm called ‘Eichinger oder Knechtl’ together with Christian Knechtl. 

Since 2005, the architectural office has been known as ‘eichinger offices’.