John Murray was a famous Scottish-Canadian oceanographer and a marine biologist, he is known as the "Father of Modern Oceanography".
Alister Clavering Hardy, was a marine biologist who was an expert on marine ecosystems and zooplankton. Alister Hardy was one of the chief scientists on the RRS Discovery as part of the Discovery Investigations. He specialized in the study of marine mammals such as whales. Alister Hardy designed and build "Continuous Plankton Recorder" (CPR) to collect the plankton samples. His research of plankton is continued by an organization called the Sir Alister Hardy Foundation for Ocean Science (SAHFOS).