Our Company Mission. The Mueller Companies consist of highly trained and motivated professionals operating within a traditional certified public accounting firm and a registered investment advisory firm. Its caring and dedicated group of individuals accept as their mission: To provide you with the highest level of service in the areas of income taxation, accounting, financial planning and business matters.To provide you access to a staff of professionals diverse in their backgrounds and expertise yet committed to "total quality service."To provide you with guidance toward paths to your financial security.To provide you with solutions in times of financial uncertainty.To provide you with the power of planning. Most of our clients are individuals or small businesses. We also work with pension plans, trusts and estates. We principally accept new clients only through the referral of other professionals or our existing client base.