Special Needs Adult Services McKinney TX | Mentally Disabled Adult Care | Cerebral Palsy | Adult Cognitive Disabilities | Downs Syndrome Care McKinney TX

Our Staff

Employment at Cornerstone Ranch is not a job or part of a career path. It is about about being called to a lifestyle of service. Our staff is dedicated to our residents 24/7, committed to live on site and in community together. Since our inception, we have had minimal staff turnover, which is one of the most beautiful hallmarks of providing our residents with a sense of stability and community.

Mary Klentzman, Executive Director

klentzman family

Mary joined the Cornerstone Family in May, 2014, with over 14 years of experience working for and with nonprofits that serve families affected by disability. As the mother of seven children, one of whom has severe cerebral palsy, she and her husband, Rick, are very aware of the needs and concerns of families who have a child with a disability. Her own desire to find opportunities for her son led her to participate on numerous committees and councils that impact state policies related to the services offered to people with disabilities. As a result, she is perfectly suited to lead Cornerstone into a new era and help expand our offerings to the special needs community. Mary is blessed to have children who are talented musically, academically and athletically and enjoys watching each of her children grow and mature into adulthood. Mary’s family continues to expand with two spouses and three grandchildren.

Doug & Miranda Schulte, Program Director/Lead House Parents

Cornerstone Ranch McKinney TXDoug and Miranda met at and graduated from Dallas Baptist University. During their time at DBU, both Doug and Miranda volunteered with Capernaum Young Life (Young Life’s ministry to the special needs population). Upon graduation, Doug took over as the Area Director for Capernaum Young Life in Dallas, and Miranda became a teacher at Notre Dame School of Dallas. In August of 2006, the Schulte’s joined the Cornerstone staff as direct care providers.  From the start, the Schulte’s have had various roles at Cornerstone, most recently accepting their dream position as full-time House Parents. Doug provides leadership as our Manager of Operations.  The Schulte’s count it a blessing to raise their two sweet daughters in such a unique community.


Andrew Prahl, Direct Care Staff

Andrew Prahl, Cornerstone RanchAndrew graduated from Dallas Baptist University in 2007 with a BS in History. As a freshman in college, Cornerstone’s Program Director, Doug Schulte, introduced Andrew to Young Life’s Capernaum ministry for students with disabilities. He continued volunteering with Capernaum in Dallas for almost seven years. Andrew then moved to Arlington, Texas, where he spent several years as a part-time staff member for Young Life and a part-time youth pastor at a local church.

Andrew has a passion for people. He has been particularly challenged to live a life of service as described by Matthew 25:40, “Truly I tell you, whatever you did for one of the least of these brothers [and sisters] of mine, you did for me.” He couldn’t be more grateful to live alongside the Cornerstone residents and be a part of such a wonderful ministry. He hopes to begin seminary soon and pursue a Master’s of Divinity. Andrew married Victoria, the love of his life, on Cornerstone’s property.

Andrew has a diverse range of interests, including improving his musical talents, American history, computers, his Toyota Land Cruiser, the Texas Rangers and Dallas Cowboys, and the great outdoors.