Catherine Sarah Wood Marshall LeSourd (September 27, 1914 – March 18, 1983) was an American author known for her nonfiction, inspirational, and fiction works. She was the cherished wife of the well-known minister, Peter Marshall. Marshall's life was marked by both personal struggles and professional achievements.

Marshall's journey with illness began in 1940 when she contracted tuberculosis, a daunting challenge given the lack of antibiotic treatment at the time. She endured nearly three years of recovery. Tragically, in 1949, her husband passed away from a heart attack, leaving her to care for their 9-year-old son, Peter John Marshall, who would also follow in his father's ministerial footsteps and become an author.

Her literary journey took a pivotal turn with the publication of A Man Called Peter, a biography of her husband, in 1951. The book was a nationwide success and was later adapted into a film released in 1955. This success propelled Marshall to continue writing, eventually authoring or editing more than 30 books, selling millions of copies. In 1959, she married Leonard LeSourd, the editor of Guideposts Magazine, and together they founded Chosen Books. They had three children: Linda, Chester, and Jeffery. Marshall's legacy continues to inspire, marked by her perseverance through adversity and her profound impact on literature.