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.
Many ecologists work for state and federal government natural resource agencies. These workers may write environmental impact statements evaluating the potential effects of industrial, commercial, and public sector projects. Others manage ecological resources as natural resource managers.