We have lost one of the greatest founders of modern stereology, Hans Jørgen Gottlieb Gundersen. As a professor at the Stereological Research Laboratory at Aarhus University, he discovered a number of revolutionary methods for accurately determining the number and size of cells and structures, based on spatial sampling principles: disector, fractionator, proportionator, nucleator, rotator, point-sampled intercepts, orthogonal intercepts, vertical sections, isector, and 2D unbiased counting frame. As a true stereologist, Hans Jørgen never counted everything, he estimated the structural quantities in a sample of the whole organ/structure and therefore he also contributed greatly to the estimation of the error variance - coefficient of error - of the estimate. He economized sampling in the famous paper 'Do more less well!'.
The obituary was published in Image Analysis & Stereology in his memory: