Alexander Turney Stewart was an influential American businessman and philanthropist, born on April 12, 1803, in Ireland. He is best known for founding the first department store in the United States, known as A.T. Stewart & Co., which opened in New York City in 1846. His innovative retail strategies and focus on customer service revolutionized the shopping experience. Stewart became one of the wealthiest men in America during the 19th century, amassing a fortune through his successful retail ventures. He was also a notable philanthropist, contributing to various causes, including education and the arts, before his death on April 10, 1876.