Wynn was born in Houston, Texas, and earned a history degree from Rice University in 1972. She later attended the American Graduate School of International Management in Glendale, Arizona, for her Masters, and gave up a respectable career in international banking to make an abortive attempt at entering veterinary school. Deciding to stay at home and take care of her children instead, she has dedicated the remainder of her life to being a starving author with a passion for history. She sold the first book she ever wrote to Harlequin in 1987, but made up for this great start later with several unsold manuscripts dispersed lightly amongst the aforementioned published titles.

When Pat's at home, she occupies an empty nest in Newport Beach, California, with her husband and a new spoiled little puppy named Puppet.