mid-15c., from Middle French attestation and directly from Latin attestationem (nominative attestatio) an attesting, testimony, noun of action from past participle stem of attestari to prove, confirm (see attest).
Work Environment. Epidemiologists generally work in clean, well-lit offices and laboratories. In addition to hospitals, epidemiologists work in colleges and universities, schools of public health, medical schools, and research and development services firms.
Ecologists work in many areas. An ecologist may be employed in private industries such as those that produce energy, timber, and fish. They may also be employed by universities, government agencies, consulting firms, research laboratories, and museums. Ecologists may work in laboratories with dangerous or toxic substances.