We had topics where dopers would name there own areas of expertise, but I think it would work better if we had people name other people’s areas of expertise. Name either what they do for a living or what they seem knowledgeable about.
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Qadgop the Mercotan**- LOTR and medicine.
picunurse - Nurse.
Bricker- Law.
vetbridge - Veterinarian.
drachillix and Kinthalis - Computers.
**Cervaise **and **lissener **- Movies.
LunaV - I think she has a new name now but I remember her knowing something about history.
gabriela - Dead people.
Sorry, I know next to nothing about history. Thanks, though!
**Colibri ** - any and all things avian related.
**Twickster ** - word maven. Anything puzzle related.
Wile E. - cats. 
for the record I would like to be known as having an expertise in murder. and my art. Murder and art.
Middle Eastern history - Tamerlane
Tae kwondo (and being dead) - Clothahump.
phone sex - norinew.
prison guard - Little Nemo.
Annoying and pointless signoffs -
Regards,
Shodan
Wordman – music
Jodi - also law
EddyTeddyFreddy - horses
Sampiro - writing; having a messed-up but oddly endearing family
Omi no Kami - linguistics
Polycarp - religion
tuckerfan – cars. (Actually I recognize all the same names in every cool car thread, but he’s the only one I’m sure of.) Maybe bricker? Silenus?
Oh, silenus = beer. swampbear too!
lobstermobster – murder. And art. 
twickster – puzzles and gardening.
eleanorigby – nursing, and library science
tomndebb – everything
Qadgop the Mercotan also knows cheese.
Eve is an early 20th century film historian, and has written some bios on the subject.
Gorillaman - East Anglia and football
Annie Xmas – Andrew Lloyd Webber, and all things Broadway.
glee – chess
elelle knows way more than I do about native plants, and featherlou is also more knowledgable than I am about gardening in general.
…
cmkeller–Orthodox Jew and Legion of Super-Hero comics.
Qadgop the Mercotan also knows prison systems. QtM knows a lot!
Stranger on a Train - Everything
Blaster Master - Math
Matt MCL - Canadian politics
WeirdDave - Insurance
TomnDebb - Religion
WhyNot - Herbs and natural medicine
TUBADiva–The TUBA
EddyTeddyFreddy–Limericks
danceswithcats - House infrastructure (electrical, plumbing, etc.)
OpalCat - Juggling.
Jonathan Chance - Diplomacy (the game).
LVgeogeek - Southern Nevada rock strata underlying a certain city.
Sauron - Rants par excellance.
ultrafilter - weightlifting
Here are a few random ones that come to mind:
Exapno Mapcase – publishing
Johanna – foreign languages (various)
Mangetout – edibility
Omniscient and Ellis Dee – the NFL
Jackmanii – pathology
Crowder – Man U
Duckster - volcanics
Una Persson - coal, coal plants, seemingly a fair bit of quite a lot.
psycat90 - wine and viticulture.