Peter Gæmelke blev landbrugsuddannet i 1977, og arbejdede som driftsleder inden for planteavl på Dalum Planteskole fra 1977 - 1983. I 1983 blev han ejer af gården Røjgaard ved Vejen, som han driver sammen med tre nabogårde.
Gæmelke har siddet i Globaliseringsrådet siden 2005.
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