Agree, generally nothing positive about losing an executive. But no one knows why he left. Several theories have been stated and any could be correct. Personally, I bet it is most likely related to the Locust Walk services being basically what his background/experience was related to so future need for his services might have been seen as dwindling. The same could be said for any deal or buyout that might occur. He has marketable experience and may have simply decided to take his stake and move on to a place where his active involvement might be needed more. The only thing I'm sure of is that no one posting on a message board knows why he left. I'm planning to add more in the near term.