Found these two things about Peter Geissler.
The first is commercial with a telephonenumber (from august 2006)
The second one comes from the website
*Garter Snake Home Page - Alan Francis
The webmaster knows him, I understand from the text.
Maybe he can help you.
Succes...
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Guatemala-Strumpfbandnatter", NZ 05, NZ 06, selten in dt. Terrarien. Sehr gute Fresser (Fisch,Mäuse). Bis max. ca.70cm (Weibchen), Männchen kleiner. Haltungsbedingungen ähnlich wie andere Thamnophis.
Versand möglich.
Bild kann angefordert werden. Peter Geissler Telefon:
09283 1613
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There appears to be some confusion amongst herpetologists as to what constitutes the "true" Florida blue garter snake - subspecies "similis" as opposed the blue coloured variant of "sirtalis". True similis are from a limited distribution on the north western Florida peninsula, and thus the majority of imported Florida garter snakes are not of this subspecies, but are merely a blue strain of Thamnophis sirtalis sirtalis. After discussion and analysis of photographs with Thamnophis experts of more experience than me (personal communication, Jurgen Chlebowy, Peter Geissler, Philippe Blais MD,) I accept that my animals are of the nominate subspecies, T s sirtalis.