The company man is knowledgeable in the area of drilling operations and to some extent completion operations. He/she is not generally responsible for defining the technical aspects of the well, but instead works with a team of office-based engineers and geologists and is the team member responsible for carrying out the written drilling program in an efficient and safe fashion. Since most of the physical work is carried out by contractors that may have separate interests from the oil company, the company man is often the sole representative of the oil company on location to ensure that plans are carried out according to specifications, time-lines and budgets. The company man usually gives orders only to the supervisor(s) of the drilling contractor and various service companies, lest he/she run the risk of violating the "Independent Contractor" concept and possibly incurring additional liability (e.g., for personnel injuries) for his/her own company.