This element's founder is a British chemist named Smithson Tennant and he found the element in 1803. He came across the element while he was combining Alkalie and Acid treatments and then separating them. During this procedure he not only found the element Osmium, but he also found the element Iridium. The pictures below are the two findings. The one on the left is Osmium and the one on the right is Iridium.