A consultant (from the Latin consultare means "to discuss" from which we also derive words such as consul and counsel) is a professional who provides advice in a particular area of expertise such as management, accountancy, the environment, entertainment, technology, law (tax law, in particular), human resources, marketing, medicine, finance, economics, public affairs, communication, engineering, sound system design, graphic design, or waste management.

A consultant is usually an expert or a professional in a specific field and has a wide knowledge of the subject matter. A consultant usually works for a consultancy firm or is self-employed, and engages with multiple and changing clients. Thus, clients have access to deeper levels of expertise than would be feasible for them to retain in-house, and to purchase only as much service from the outside consultant as desired. It is generally accepted good corporate governance to hire consultants as a check to the Principal-Agent problem.Fact: date=September 2007'''

'Consultant' is also the term used to denote the most senior medical position in the United Kingdom, Australia and Ireland (e.g., a consultant surgeon).'

Ways in which consultants work

Often a consultant provides expertise to clients who require a particular type of knowledge or service for a specific period of time, thus providing an economy to the client. In other situations, companies implementing a major project may need additional experienced staff to assist with increased work during that period.

Consulting has come under some criticism because of staff augmentation and the high amount of jargon consultants use, also known as consultantese.Fact: date=September 2007

Sometimes a consultant is not an independent agent but is a partner or an employee of a consultancy, that is a company that provides consultants to clients on a larger scale or in multiple, though usually related, skill areas.

Strategy consultants are common in upper management in many industries. There are also independent consultants who act as interim executives with decision-making power under corporate policies or statutes. They may sit on specially constituted boards or committees.

See also

• Management consulting
• Tax advisor
• Information technology consulting
• Foreclosure consultant
• Human resource consulting
• Public consultation
• Umbrella company
• Certified Management Consultant
• Political consulting
• Consultant (medicine)
• Independent contractor
• Contingent workforce
• IRS Reclassification
• Permatemp

• Biotechnology consulting
• Consultant pharmacist
• Creative consultant
• Educational consultant
• Elevator consultant
• Employment consultant
• Knowledge management consultant
• Lactation consultant
• Legal nurse consultant
• Loss control consultant
• Magic consultant
• Media consultant
• Process consultant
• Professional and Technical Consultants Association
• Statistical consultant
• Theatre consultant