He kept an online diary for KSTP-AM, a St. Paul, Minn., radio station. The last entry was made on April 26, shortly before the Abu Ghraib prisoner abuse scandal broke. Shortly after that date, the diary was removed from the radio station's website. However, a copy of the April 11-April 26 entries was retrieved from the Google cache: see Joe Ryan Abu Ghraib diary April 2004.
The Ron Rosenbaum & Mark O'Connell show section on KSTP's website mentions Ryan as a friend of the show. It says, "Joe Ryan -- Frequent contributor and caller, Army linguist and security expert, now overseas as an interrogator." 
- The Google cache link for the April 26 entry. The Google cache only keeps pages for a short period, so this link no longer works. However, it is of historical note as it records how the rescued article was retrieved.
- www.am1500.com/personalities/joeryan.htm The original URL for Joe Ryan's diary - no longer available.