Accounting Services, Tax Services, Payroll Processing & Management Services. Accountants and Tax Consultants Since 1975. If growth is your goal, John Ducker & Co. can help. We are dedicated to helping entrepreneurial growth companies succeed. We can helpyou get where you are going faster. In todays economic environment, it is important to be linked to a company with the commitment, the capabilities and the experience of John Ducker & Co.