Stefan Stenzel. he's Mr. Waldorf.
Robert, you got the +100 association bonus in Jan 2 '14 and the reason was that your dsp.stackexchange.com rep got to 203 by a +10. This was 8 days before you joined any of the other sites, and more than half a year after Peter recognized and greeted you in dsp.stackexchange.com.
Soooooo, you don't need to be on any other sites to get the association bonus it seems, as long as you hit 200 rep.
Well, his rep outside of Signal Processing is 1.
In order to qualify for the bonus 100 points, you need to have at least 200 rep on the original site.