Ok… well we are discussing the fictive ability to speak with somebody who is dead. I’m assuming that whatever necromancy/chronomancy is involved included some sort of translation.

Hell, if it’s necromancy then the only thing we might get out of poor Leo is a “cerveeeeeeelli” before he lunges across the table :-)

I’d go for Leonardo. The others - while I understand things at a basic level - I’d likely not be able to understand most of their fields.

Maybe Tesla but I’m not sure if the conversation would end up centered around some of the neat science stuff I could grasp or pigeons with laser-eyes …

As far as ones who actually did things there I’m not sure that Hawking would have even been physically capable at a point where he was famous.