Previously I have interviewed Frank Zindler, Richard Carrier, David Fitzgerald, and Robert Price, all of whom are 'mythicists'; they don't think there was ever anyone alive whom we could recognize as either Jesus or Moses.
Of the lot of them, I would have thought that Price was the foremost expert, but he referred me to D.M Murdock, also known as Acharya S, author of 'Did Moses Exist? The Myth of the Israelite Lawgiver'.
The Ra Men podcast EP10 - Did Moses Exist? with D.M. Murdock