Who is an example of a robber barron?
No. The term "Robber Baron" dates from the early 1900's when men like Rockefeller, Carnegie , Pullman, Goodyear and others controlled all the economic wealth of the country . Our robber barons now are the bankers and stock exchange as well as the gas companies. When a company makes profits without adding to the society and only takes it is a robber Barron or pirate.
If you are asking about the explorer Clark he was not a robber barron and that term wasn’t used in 1806. In fact, he was very poor and wrote a book about his expedition with Lewis. Clark died on his way to Washington to speak to congress about trying to get paid for his work on the expedition. Some historians think it may have been murder.