Hegre, McMahon, & Schimmel, LLC is a full service middle market certified public accounting (CPA) firm. Hegre, McMahon, & Schimmel, LLC is a full service middle market certified public accounting (CPA) firm, with two locations (Oak Brook, IL and Merrillville, IN). We provide services to clients in the Chicagoland area and Northwest Indiana. Our services include small business accounting, bookkeeping, audits, income tax return preparation, compilations, tax preparation services, and Quickbooks assistance to clients in various industries, including, but not limited to, manufacturing, distribution, retail, professional services, personal services, automobile dealerships, real estate investment, real estate developers, and medical practices.