Arakawa Hiromu was born on May 8th, 1973 in Hokkaido (Japan) with an A blood type. She has stated she was risen at a farm in the country, which probably inspired her cow avatar as well as her "equivalent exchange" theory for FMA.
There are not official Arakawa photographs available, as far as I know her physical appearance is a mystery (though there's one single blurry pic floating around, which was supposedly taken at some awards ceremony). What we know for sure is that Arakawa's a she, don't let anyone fool you.
Her first work was a one-shot called STRAY DOG, which won the first prize in the 21st Century "Shounen Gangan" 9th Awards. In August 1999, this same work debuted in Gangan. Her next works were Totsugeki Tonari no Enikkusu and Shanghai Youma Kikai (The Shanghai ghost mistery), both of them one-shots and published in Gangan during the year 2000.
Then, in 2001 (in the August issue of Gangan), the first chapter of Hagane no Renkinjutsushi (Fullmetal Alchemist) was published, becoming her first serialised manga and her greatest hit to date. In 2005, in the August edition of Monthly Sunday GX (the latest CLAMP work, Kobato, is published here), she released the first chapter of a new series titled RAIDEN-18 as a colaboration for this magazine's 5th anniversary. A second chapter was released at the beginning of 2006, but it's still unknown whether the series will continue or not.
In March 2006, Arakawa released a new Shanghai Youma Kikai chapter, six years after the first one. It's supposed to be an continuation to the story from the drama CD based on the series that was to be released that same month.
Please, consider visiting A Beautiful Mind for more information on Arakawa, her works and the approved fanlisting. Part of the Roy Mustang Network.