Martha Helen Stewart (née Kostyra; Polish pronunciation: [kɔ'stɨra]; born August 3, 1941) is an American retail businesswoman, writer, television personality, former model, and convicted felon. As founder of Martha Stewart Living Omnimedia, she gained success through a variety of business ventures, encompassing publishing, broadcasting, merchandising, and e-commerce. She has written numerous bestselling books, is the publisher of Martha Stewart Living magazine, and hosted two syndicated television programs, Martha, which ran from 2005 to 2012, and Martha Stewart Living, which ran from 1993 to 2004.
In 2004, Stewart was convicted of charges related to the ImClone stock trading case. There was speculation that the incident would effectively end her media empire, but in 2005 Stewart began a comeback campaign and her company returned to profitability in 2006. Stewart rejoined the board of directors of Martha Stewart Living Omnimedia in 2011 and became chairwoman of her namesake company again in 2012. The company was acquired by Sequential Brands in 2015.
She is also known as Martha Helen Stewart.