Business & Individual Tax Returns. Kean & Company LLC is an accounting firm serving the Rolla, Missouri and surrounding areas. We specialize in business and individual tax returns. We provide all accounting and auditing services as well as payroll services. Mark Kean, owner, is also a certified Quickbooks Pro Adviser. He is a member of AICPA and MSCPA. Call us today for all your individual and business accounting needs! Electronic filing available!