Tiffany Grant has been working the anime voice-acting circuit for ages -- all the way back to 1973. Most of her work is through ADV and FUNimation, which is no surprise considering she is married to Matt Greenfield, the co-founder of ADV.
Tiffany appears in over 117 animes in one form or another. Her most famous role is that of Asuka Langley Soryu from Evangelion, but she's also been in other 'big' anime hits like Bubblegum Crisis, Fullmetal Alchemist, Gunsmith Cats and Blue Seed.
One item that a lot of otaku don't know about Tiffany is that she's written a lot of English scripts for the dubbed versions of animes, including Ah! My Goddess! Flights of Fancy and Evangelion.
Tiffany and Matt live in Texas, and both are still active in animes and conventions, where Tiffany has been known to show up in Asuka's red plugsuit.