Mark Epstein is a teacher and real estate agent in the Columbus, Ohio, area. He also has 30 years of experience as a professional writer and editor, at newspapers, a New York publishing house, an academic journal, a PR shop, and as a freelancer. Mark's holds a Master's degree in City and Regional Planning and a Bachelor's degree in political science. He has won awards for his academic papers. He also has a certificate in real estate sales in Ohio.
Mark's pet peeves regarding grammar, usage, and style are numerous. Once a strong prescriptivist, he now concedes that the rise in descriptivism sometimes makes sense in some cases. However, Mark doesn't see a compulsion to accept a decline in standards, just a bit more flexibility--an open mind to consider evolving rules in usage, grammar, and style.
In perusing Wikipedia articles, Mark finds (and corrects) far more errors than seem necessary. Mark also seeks out mistakes that are particularly egregious. His favorite Wikipedia-related pastime is which hunting.