Doctor Harris was a Dakota-based physician.
History
Out of uncertainty about the long term effects of the Big Bang, Virgil visited doctor Harris' clinic. In the initial interview, Harris tried to make sure the "changes" Virgil was going through weren't just puberty. Still puzzled as to why the boy wanted to be tested, he went ahead anyway to calm him down.
After the results came in, Harris informed Virgil that his electrolytes were high, and advised him to cut down on fries and pizza for a while.