John Sharon
From Tardis Wiki, the free Doctor Who reference
John Sharon, like the rest of his family, was part of Global Response.
After the end of the organisation, he became a physician. He went to a rainforest to help a tribe contaminated by an attack by the Myloki. He told the Second Doctor that Grant Matthews was likely still on Sharon Island, where he had sought refuge years before. (PROSE: The Indestructible Man)