You mean the Vienna Circle --- ok. Yeah I guess they changed the name from positivism to logical positivism, as I recall.
Exactly so - Schlick and Carnap in Vienna, and Hans Reichenbach and Kurt Grelling in Berlin (and many others, of course). Schlick sort of started it, and Carnap did a great deal of work towards rigorously and formally explicating and deriving the whole thing - not surprising, since Carnap studied under Gottlob Frege, who is, in many ways, the founder of modern formal logic.
It also ended up having a great deal of influence here in the US, also - a great many of the positivists fled the Nazis in the 30's and set up shop over here, particularly Herbert Feigl and whatshisname, something Frank. Philip Frank?
Something like that ;)