I will pass over to Holger Matthes (HoMa), another “old timer”, and someone who knew Heiner well to share their thoughts.
I knew Heiner for more then 10 years and he was one of the early guys forming the German AFOL scene.
Heiner is well known for his neverending hunt for yet another color variation of the iconic Blue Hopper. His website mentions more then 25 variants:
http://www.heinerberg.homepage.t-online.de/index-e.html
http://www.brickshelf.com/cgi-bin/gallery.cgi?m=HeinerBergLately he concentrated on rare colors for roofs and he knew all the existing slope elements in fancy colors and came up with a really colorful and detailed layout to present his trains and other building.
Rest in peace Heiner!
If you remember Heiner, please feel free to write down your memories below. For those of you who feel more comfortable writing in German, 1000Steine have a memorial thread.