Hello.
I'm anthropologist located in Warsaw. I used to cooperate with the Institute. Additionally I have experience working with archives and I can check the photos in other institutions (ex. Warsaw Museum, National Archive etc.)
Also, my family is from Warsaw since generations and I have knowledge about the city, the changes which appeared here (ex. Tlomackie street was not recognize as separated street till 70's of XIX c.), as far as different transcription of surnames (already checked and mentioned surname could be written as Bernstein, Bersztein, Bernshtein and severl local variations depending on the writer) etc.
Also, as I don't know what exactly informtion you want about the gentlemen, but I made fast online research and he was quite interesting person (if I'm correct about the person himself) but for further research it would be necessary to doublecheck the facts :)
Regards :)