KD Irani is a Zoroastrian philosopher. This is my favorite video of his
Touraj Daryaee is an Iranian historian with the University of California. He has a lot of work on the Sassanians and pre Islamic Iran.
Richard Foltz is an Iranian studies prof at Concordia University in Canada. He focuses more on the current Zoroastrian community in Iran and other Zoroastrian communities in the world.
Mary Boyce was an expert on Zoroastrianism, but she passed away about a decade ago. She is the best source for Zoroastrian history and communities in Iran today.
Ali A Jafarey is a Zoroastrian from Iran, he has been one of the main proponents of the Gathic reformation within the faith.
These are the few I know off the top of my head, I'm sure there are many more.