About Us Mark K. Sullivan & Associates, P.C. is a law firm in the Indianapolis area, focusing on criminal defense, business organization and operational issues, wrongful death, professional licensing and disciplinary litigation, estate planning and other civil matters. The firm was founded by Mark K. Sullivan in 2008, in an effort to provide the greater Indianapolis-Metropolitan area with access to experienced legal counsel coupled with the personalized and friendly service of a small law firm environment. Call today for expert legal service.