Alhaitham is a marine biologist in Teyvat as the job only requires him to do dives and study marine life while also making sure the marine lives are well. He is not one to converse with other people unless they managed to pique his interest. He is extremely smart and talented and many huge companies had came and asked him to work for him, it was to go as far as the government even tried to recruit to which he refused and continued to work as a marine biologist near the beach around Sumeru.