I'm searching too about L. Eisenberger. The only information I found is the existence of some sculptures (from auctions): 1. "Nude" 12"H - 9"W - 4"L, Bronze male statue; Nude with belt and helmet standing on a sign with an eagle and S P O R. 2. a letter-opener, the upper part forms the body of a miner with a stone on his shoulder 3. a nude female with a shell in the right hand. I'm sure he was german, but up to now I couldn't find nothing about his life in the german literature. Perhaps You was more successful. In thís case let me know about the results of your investigations.