Joe Mitchell,
Computational Geometry,
Applied Math professor at SUNY Stony Brook.
William F. Mitchell,
Scientific Computing, NIST.
In professional circles, I usually use my middle initial,
Scott A. Mitchell. Here's a few reasons why:
Scott Mitchell, football quarterback.
Scott Mitchell,
Active Server Pages (ASP) expert.
Scott Mitchell,
Canadian geologist.
I've also seen computer science paper citations for another Scott Mitchell in Europe.