Martha Helen Stewart (née Kostyra; born August 3, 1941) is an American business magnate, media personality, author, and magazine publisher. As founder of Martha Stewart Living Omnimedia, she has gained success through a variety of business ventures, encompassing publishing, broadcasting, and merchandising. Her syndicated talk show, Martha, is broadcast throughout the world, she has written numerous bestselling books, and she is the publisher of Martha Stewart Living magazine..