Kay is most frequently hailed for his successful research and development work in Nigeria to introduce soy products and thus help the local people overcome their lack of protein. For these efforts, he is known as the "father of African soymilk."
郭惠二最為人津津樂道的成就，是在非洲奈及利亞成功研發、推廣黃豆製品，改善當地居民蛋白質嚴重缺乏的問題，外界因此稱他是「非洲豆漿之父」。