“Does anyone know who wrote the אור ישראל?”
Uber,
If you are referring to the above link, its a Journal (monthly or quarterly) with many contributing Rabanim, scholars , manuscripts, etc. You can find most of it on Hebrewbooks. The one I posted has two write-ups on the above topic. One is pro and one is against. (just click on the link and scroll further…)
If you are referring to a Sefer, there are few. One that comes to mind is from Rav Yisrael Salanter.