Oil drilling in Ohio began in 1860. For a period of time the oil fields in Lima, Ohio were the largest in the world. Although much of the oil in the state has either been extracted or is not economically feasible to drill, a few companies are continuing to drill. According to Dow Bowman, owner of Bowman Drilling Company, “Most of the oil and gas in southeastern Ohio and eastern Ohio over the last 100 years has been drilled. We are going back through old fields now trying to squeeze out any area that may have been missed."