Prompt
Generate a realistic image of Daniel Callahan, an American bioethicist, author, and philosopher, in a contemplative setting, possibly surrounded by books or in a study, reflecting his work in bioethics and philosophy; he should be depicted as an older man from the mid-20th century, given his birth and death dates (July 19, 1930 - July 16, 2019), with a thoughtful expression, wearing attire consistent with his professional life, such as a suit or a blazer, in a style that conveys intellectualism and introspection.
