I'd agree with upnorthunter on that one - though I've never seen a fisher with a head that light (most of them here are uniform dark brown)
Pine martens typically have a light colored throat area (buff to light rusty orange-ish in good light) - this guy has a dark throat.
daverd1 were do you find all them pine martins, thats cool. Spectr I've gotten two pics at two differant times both at night. I've seen one dead on the road and one alive crossing the road during the day, but thats it in the last 38 years.