About Us When you are in need of legal services, you want to turn to a law practice that you can trust. At Denefe, Gardner & Zingg, P.C. in Ottumwa, IA our specialized lawyers have the experience to prove that they can give you quality representation by competent, experienced attorneys. Contact us today to set up an appointment and find out how we can give you the results that you are looking for.Call or email us today to find out more about our practice or to set up your first appointment with our experienced attorneys.