Stewart graduated from Nutley High School. Stewart was also active in many extracurricular activities, such as the school's newspaper and art club. Her father had a passion for gardening and passed on much of his knowledge and expertise to his daughter. Later, she learned the processes of canning and preserving when she visited her grandparents' home in Buffalo, New York. Stewart's mother taught her how to cook and sew. During her college years, she supplemented her scholarship money through 'modeling jobs at $50/hour - which was a lot of money at that time.' Among the companies she modeled for was Chanel. She went on to appear in television commercials and in magazines, including one of Tareyton's 'Smokers would rather fight than switch!' cigarette advertisements. At 15, Stewart was featured in a television commercial for Unilever. Mickey and Merlyn Mantle had four sons, whom Stewart watched and for whom she organized birthday parties.

When Stewart was 10, she worked as the occasional babysitter for the children of Mickey Mantle, Yogi Berra, and Gil McDougald, all players for the New York Yankees. She adopted the name 'Grace' for her Catholic confirmation name. When Stewart was three years old, the family moved to Nutley, New Jersey. Both her parents were teachers, her father later becoming a pharmaceutical salesman. She is the second of six children born to parents Edward Kostyra (1912–1979) and Martha (née Ruszkowski 1914–2007) and is of Polish heritage.

Martha Stewart was born in Jersey City, New Jersey, on August 3, 1941. The company was acquired by Sequential Brands in 2015. Stewart rejoined the board of directors of Martha Stewart Living Omnimedia in 2011 and became chairwoman of her namesake company again in 2012. 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.

In 2004, Stewart was convicted of felony charges related to the ImClone stock trading case she served five months in federal prison and was released in March 2005. She has written numerous bestselling books, is the publisher of Martha Stewart Living magazine and hosted two syndicated television programs: Martha Stewart Living, which ran from 1993 to 2004, and The Martha Stewart Show, which ran from 2005 to 2012. As founder of Martha Stewart Living Omnimedia, focusing on home and hospitality, she gained success through a variety of business ventures, encompassing publishing, broadcasting, merchandising and e-commerce. Martha Helen Stewart ( née Kostyra, Polish: born August 3, 1941) is an American retail businesswoman, writer, and television personality.

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