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What was William Clark's job during the Lewis and Clark expedition?

Answer:
Prior to the expedition, Clark was in fact Lewis' superior officer and was very experienced in handling boats. While Lewis spent his time in St. Louis gathering information, Clark did most of the work of turning the disparate crew into an integrated corps. Clark served mainly as the expedition "doctor" and as co-captain in updating the journals. He often traded medical care for food and eventually established a reputation among the natives for his skills. Finding a man with a tumor on his thigh who couldn't walk, Clark cleansed and dressed the wound and left him some soap to wash the sore. He soon got better and as Clark says "this man assigned the restoration of his leg to me."
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