I found some more information on this Michael Failey. He's described as a research chemist in explosive ordnance systems. He worked at one time for Battelle Columbus Ordnance Systems and Technology Department.
Here are some links describing Failey's work as an investigator of a chemical explosion:
Whether this has any relevance to the anthrax investigation is doubtful, of course. But the more information, the better.
I should have added, for what it's worth, that there is apparently a Greendale School District in Greendale, WI, a suburb just south of Milwaukee. (There is a Greendale High School and a Greendale Middle School, but three different elementary schools with different names.) I don't have an address for Failey, and I don't know where he might have gone to school, but his house (or is it his mother's house?) is said to be on the west side of Milwaukee.
(Needless to say, the reference here is to the anthrax mail return addresses. Again, this is just another data point. There are many other Greendales in the country.)