I hate to call myself an expert on anything, but I can talk intelligently and knowledgeably about:
Science Fiction (in the academic and the fan sense)
Anime and manga as art and tropes
East Asian culture, primarily Japanese and Chinese (more then the typical anime/wuxia fan, less then a native, resident, or formal student of it)
Buddhism (the Zen school of the Mahāyāna tradition, specifically)
Information Technology as a field and a profession
Philadelphia and surrounding area
United States political theory, history and practice.
Lots and lots of 'useless' knowledge and factoids. (The longest golf hole in the world is the seventh hole at Satsuki Golf Club in Sano, Japan; a 964 yard par 7. I don't play, follow, or enjoy golf. I have never been able to determine how or why I know stuff like this.)
I also have access to people who are highly knowledgeable in automotive racing (primarily F1), trains (US with some of the rest of North America), and the geopolitical and psychological history of the post WWII and Cold War eras.