Stephen and Mary Weller live in Texas. They enjoy spending time in bookstores, participating in fan conventions, and attending concerts. They have three sons and one daughter.

Stephen and Mary enjoy traveling and volunteering with the community. In 2018, they traveled to Puerto Rico to help repair roofs damaged during Hurrican Maria. They still give free talks to MHA Performance Improvement classes that talk about lessons learned from both the Progressive Machine and The Progressive Hospital.

They self-published their first book, The Progressive Machine: Before We Called It Lean, in December 2019. Soon after, they were picked up by Warren Publishing. In July, 2021, they published the second edition of their The Progressive Machine: Before We Called It Lean, along with a new book, The Progressive Hospital: A Lean Hope. 

Whereas the first book was a nonfiction, The Progressive Hospital was written as an educational thriller. In that book, they drew on lessons learned from working with over fifty hospitals on their surgical programs across the Americas. These first two books became required reading for at least one Masters of Health Administration college program. 

In 2022, the Progressive Hospital was translated to Spanish, earning a #1 new release rating from Amazon. 

The success of The Progressive Hospital as a fictional story convinced Stephen and Mary to finish a book that they began in October 2005; a Young Adult Science Fantasy novel. This bold move would mix fantasy and science fiction to create a unique story. Seventeen years later, in January 2023, Kantara | The Traveler was published, followed by the sequel, Kantara | The Captain in 2024.