The influential philosopher born in 1964, focusing on ethics and morality, is Peter Singer. He is widely recognized for his groundbreaking work in utilitarian ethics and animal rights, particularly in his book "Animal Liberation." Singer argues for a reevaluation of our responsibilities towards non-human animals, promoting a life of ethical consideration towards all sentient beings. His advocacy for effective altruism encourages people to consider the impact of their charitable efforts. His thought-provoking ideas challenge conventional moral views and have had a lasting influence on both philosophy and public discourse.