The term 'A Promised Land Memoirist' is referring to Barack Obama, the 44th President of the United States. Obama wrote the memoir 'A Promised Land', which was released in November 2020 and quickly became a bestseller. The book details his life story, from his childhood in Hawaii to his time as President of the United States. Obama's memoir has been praised for its insight into his personal life and his reflections on the political landscape of the United States.