Derek W. Kaczmarek is a co-founder of Kaczmarek & Jojola, a tax litigation firm. Derek began his tax career as a trial attorney with the IRS in Las Vegas in 2005 and ended his in 2012 as a senior trial attorney with the IRS in Phoenix. During that time, he represented the IRS in hundreds of cases before the United States Tax Court. Derek discreetly but aggressively represents his clients.