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David Crosby began their work experience in 1979 as a Director-Territory Manager at United Animal Health. David held this position for an unspecified period of time. Additionally, they worked as a Sales Manager at JBS United, but the start and end dates are not provided.

From 1971 to 1975, David Crosby pursued their undergraduate education at Agriculture university. David obtained a Bachelor of Science (BS) degree with a focus on General Agriculture during this time.