A revenue officer (RO) is an individual IRS agent that is personally assigned to collect your debt. They will personally visit your home or place of business. They will give you a business card with their contact information. They are generally nice people. The problem is that they can be nice one week and levy you two weeks later. They are very aggressive and it is best to get good representation when you have a Revenue Officer. Call IRS Tax Fighters at 1-888-959-2671.