Dr. Mark Stewart Geyer was born in Bethesda, Maryland, on December 5th, 1951, to Charles Mac and Wilda Geyer. His father was a Navy doctor, so he spent his early childhood on a French base in Morocco. He spent most of his adolescence in Wichita Falls, graduating from Rider High School, and later joining the Army and living in Belgium for a year. He attended Austin College, graduated from Midwestern State University, married his high school sweetheart, Susan, moved to Washington, DC, where he worked for a U.S. Senator while Susan was completing graduate school, and then settled in Dallas after graduating from Baylor Dental School. He began every day with his Bible and a cup of coffee, and before leaving for work, he always left a note for his wife, Susan—often simply, "Love you Sue." Every checklist he ever made began the same way: love Jesus, then love Susan. He didn't just write those words down; he sought to live by them.

He loved many things, including the idea of motorcycles—an idea he finally turned into reality at age 71. Immensely proud of his bike, he could often be found practicing in the church parking lot at the end of the street, much to the neighbors' chagrin. He loved to ride, whether on his motorcycle or a bicycle through SMU, or along the beach of Kiawah Island in South Carolina, often accompanied by family.

Cooking was one of his great joys, and everyone knew it. His plank salmon and spatchcock chicken were legendary. Thanksgiving at the ranch was where he truly shined: each year he smoked 22 pork butts for family and friends, with everyone pitching in to prep the meat in an assembly line. He woke throughout the night to check on it—because he took barbecue seriously.

As a child he had dreams of living in and exploring the wilderness. He loved fishing, skeet shooting, camping, westerns, the ranch, the lake, Kiawah Island, and grocery shopping. He loved Bubba's chicken, Bloody Mary mix, Dr Pepper, lime sparkling water, and especially coffee. He drank it constantly and collected mugs from every city he visited, which explained both his caffeine intake and his overflowing cabinets. He loved boating and had a lifetime of canoes, sailboats, motorboats, and kayaks—along with stalling motors, bad landings, good landings, smashed fingers, running aground, running out of gas, and more joy and delight than we could ever name.

He loved being a dentist and found deep purpose in caring for his patients. He practiced in the Campbell Center Gold Towers for 45 years, building long‑term relationships and often treating three generations of the same family. His patients loved him right back, as did his devoted staff—many of whom worked with him for years and whom he loved dearly, including Sima, Nancy, Jenny, Amy, Anita, Kaelen, Tina, Barbara and others. His kindness and genuine interest in people extended far beyond his practice.

As a young dad, he participated in everything, even when he felt reluctant or unqualified. An Eagle Scout himself, he served as a Scout leader and coached football, basketball (which he himself played in high school), and baseball. He was always ready to throw a football in the front yard, hit tennis balls, or play intense basketball games with his children and nieces and nephews. He was silly, funny, gentle, intelligent, and unmistakably a big kid at heart. He gave great hugs and loved to dance—regardless of skill level.

He read every night in bed for most of his life—adventure stories, fiction, and nonfiction history—and deeply loved music. He had just begun taking guitar lessons, something he had always wanted to do. His playlists ranged from Bruce Springsteen, Dave Matthews, Neil Young, Paul Simon, CSNY, Janis Joplin, Led Zeppelin, Willie Nelson, Fernando Ortega, and the Beatles to classical music. He loved evenings at the symphony. He had alternating emotions about opera, finding Wagner too long, of course, yet spent many happy years involved in the Dallas Opera community—serving as dentist to many.

He loved hats and costumes and amassed an impressive collection, from ball caps to a Viking helmet, Morocco. You can imagine he excelled at Halloween. He enjoyed The Chosen, loved Charles Spurgeon, and spent countless hours tinkering with tools, working in the yard, fixing whatever needed fixing, and giving practical gifts—tools, fire extinguishers, headlamps, jumper cables—just in case.safari hat, chef's toque, and even a fez from his childhood in

He traveled widely, visiting every continent except Antarctica. Highlights included salmon fishing in Alaska with his close friend David, a family trip to China and Japan in 2013, and walking the Australian outback, the Cotswold Way National Trail in England and the Camino de Santiago in Spain with Susan.

He was a faithful husband, father, son and brother, often sacrificing time and sleep for his family. He did countless thoughtful things without expecting anything in return. He was kind, considerate, and authentic. Raised a Lutheran, he attended Believers' Chapel and then PCPC for the whole of his adult life. At PCPC, he and Susan taught Sunday School and were involved in the lives of one class from age 5 until HS graduation. He felt things deeply and daily held on to the promise that Jesus loved him and that he had been fearfully, wonderfully, and purposefully made.

He is survived by his mother, Wilda Geyer, who turned 100 in August; his wife of 50 years, Susan Geyer; his children, Stewart (Adina), Julia, and Edward; and his sisters, Chris and Lisa Geyer. He is also survived by his sister‑ and brother‑in‑law, Katherine and Stephen Smethie (Mark's hero); their children James (Meredith), Bradley (Rena), Justin, and Laura; and their grandchildren, Brooklyn, Jane and Adeline; and by his brother‑in‑law, Tom Stephens, Tom's wife, Kathleen; Tom's daughters, Janie and Emily (Kane); and his grandchildren, Margot and Teddy.

He was preceded in death by his father, Charles Mac Geyer; his sister‑in‑law, Brenda Stephens; and his parents‑in‑law, Jane and Fred Stephens.

He loved Jesus, he loved his family, and he lived a life marked by service, humor, faith, and quiet faithfulness. He will be deeply missed.

A memorial service will be held at 2:00 p.m. on Monday, March 23, 2026, at Park Cities Presbyterian Church, 4124 Oak Lawn Avenue, Dallas, Texas, 75219. Reception to follow.

If you so desire, in lieu of flowers, memorial donations may be made in Mark's memory to Texas A&M University College of Dentistry (formerly Baylor University School of Dentistry), Union Gospel Mission, or any organization that promotes His kingdom.

We would be grateful to hear any of your "Mark memories." If you would like to share one, please send it to us at sustegey@gmail.com.

Isaiah 25:6-9 English Standard Version

6 On this mountain the Lord of hosts will make for all peoples
a feast of rich food, a feast of well-aged wine,
of rich food full of marrow, of aged wine well refined.
7 And he will swallow up on this mountain
the covering that is cast over all peoples,
the veil that is spread over all nations.
8     He will swallow up death forever;
and the Lord God will wipe away tears from all faces,
and the reproach of his people he will take away from all the earth,
for the Lord has spoken.
9 It will be said on that day,
"Behold, this is our God; we have waited for him, that he might save us.
This is the Lord; we have waited for him;
let us be glad and rejoice in his salvation."