Mark Grierson
1959 - 2020
Geo. H. Lewis & Sons Funeral Directors
1010 Bering Drive
Houston, TX
Mark Allen Grierson
Mark Allen Grierson passed away peacefully and went to Heaven surrounded by the glory of God on Sunday, the 20th of September 2020.
Mark leaves behind a legacy of faith, humility, grace, hard work and boundless generosity. All those who knew Mark, knew him as a loving husband, dotting father and grandfather, loyal friend, and endless supporter.
Mark loved family, friends, animals and even strangers. He was the businessman in the Hawaiian shirt, with a smile like your best friend, and a heart filled with Jesus.
A native Texan, Mark was born in the Baptist Memorial Hospital to Joseph "Buddy" and Vickie Grierson on the 25th of July 1959. He graduated from Westchester Senior High School in 1977 where he met lifelong friends and was known as a star player on the football team.
Mark attended Louisiana State University and played a short time for the LSU Tiger Football team. He continued to root for the Tigers throughout his life, making a tradition of attending LSU football games decked out in purple and gold.
Not long after his graduation, Mark became a partner at a leading insurance brokerage firm, Plumhoff & Associates, and continued to be a leader in the insurance business for over 35 years. Throughout his career, Mark never turned down the opportunity to help and mentor others.
While Mark loved a wide group of people, his love ran deep too. In 1996 Mark married Debra Henshaw (he always called her Dee), and the couple quickly became known for their "sparkly eyed love for each other."
Mark not only loved people, he loved animals. None more than his beloved Gertie, the little Yorkie that never left his side.
A servant leader at heart, Mark loved helping Houston and Houstonians through countless charities and causes. Mark and Debra chaired galas for the Children's Museum of Houston, the Houston Ballet, the Zoo Ball, the Trees of Hope, Legacy Community Health, the Council on Alcohol and Drugs and I Am Waters. Together they were honored by the HSPCA, the Houston Pet Set, as well as recipients of the Legacy Community Health's Jerry D. Bartee Humanitarian Award.
Mark was an active board member for Legacy Community Health and the Houston Council for Alcohol and Drugs. He was instrumental in bringing Kids Camp to The Council on Recovery and improved the lives of countless children and families in Houston. Mark also originated and chaired an AA meeting for over a decade on Saturday mornings at the Post Oak Club which was instrumental in positively impacting many lives.
Mark served the Episcopal School Dads Club and was an active member of the Lakeside Country Club. Mark served wherever he went, so much so that in 2011, he was honored by the Social Book as "a Houston Treasure" for his many charitable and philanthropic endeavors.
When it came to faith, Mark celebrated the gift of God's amazing grace daily. He was a passionate host of the Toolbox Luncheon's and lived out their motto "to move from success to significance through a relationship with Jesus Christ." He loved attending Bethel Church and he never shied away from sharing his own struggles, frequently citing the words of 2 Corinthians 12:9 "…My grace is sufficient for you for my power is made perfect in weakness." These stories and testimonials helped countless individuals.
Mark is survived by his wife of 24 years, Debra Henshaw Grierson; his daughters, Emily Martin and her husband David; Lucy Bertsch and her husband Nathan; his mother, Vickie Schaffer Grierson; Mother-in-law, Kathy McClanahan, two grandchildren, Olivia Louise Martin and Josephine Renee Martin; brother, David Paul Grierson and his wife Lori; sister, Denise Grierson Smith and her husband Todd. He is also survived by numerous aunts, uncles, nieces, nephews, cousins, and friends.
The family will gather for a private interment and will hold a larger Celebration of Life for friends potentially in the spring of 2021.
In lieu of customary remembrances, the family requests with gratitude that memorial contributions, in Mark's name, be directed toward The Council on Recovery, Attn: Planning and Development, P.O. Box 2768, Houston, TX 77252; or to Legacy Community Health, Development Department, P.O. Box 66308, Houston, TX 77266.
Please visit Mr. Grierson's online memorial tribute page at where memories and words of comfort and condolence may be shared electronically with his family. Additionally, one may opt to receive updated service information by clicking on "Receive Notifications" on his tribute page.

Published by Houston Chronicle on Sep. 27, 2020.
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9 Entries
We love you Debra. I have so many fond memories of our summers together with you and Mark in the pool and celebrating the Fourth of July. You’re in our thoughts and prayers every day.
Ronda Carman
October 20, 2020
All my love to you and your family. My heart is breaking for you at this time . Y’all have such a great love for each other. May God give you strength at this time.
Mary Knight
September 28, 2020
I had the pleasure of working with Mark for the last 4 years. I 've always held him in high esteem based on how he treated me and my team. Little did I know just how great of a man he is. It brings me comfort that he's a brother in Christ and is now in paradise. I pray for his family's comfort & peace during this difficult time.
Henry Santos
September 28, 2020
Mark Grierson was a giant of a human being. He had a huge heart and love for his fellow man. Our friendship will be something I cherish for the rest of my life. My heart is breaking for my loss and for Debra, his daughters, his mom and his brother and sister. God bless you buddy. We who loved you will hold you in our hearts for the rest of our days. Love you buddy.
Dennis Robinson
September 27, 2020
To Mark’s family:
I’m still trying to wrap my head around this very sad situation. The Griersons lived next door growing up. I hadn’t seen Mark is years, but always thought I’d run into him around Houston, or see him at the Queensbury reunion we talk about having. My heart goes out to your family and also to the many friends that will miss Mark. I hope we can all be comforted by our memories and in knowing that Mark embraced God’s grace. I send my deepest condolences.
Margi Low Jordan
Margi Jordan
September 27, 2020
The Westchester Alumni Association, along with the Class of 1977, express our deepest sympathy to the family of Mark Grierson.
Westchester Alumni Association Inc
September 27, 2020
What’s a loss for all of us but heaven gained a treasure with Big G!! He’s a legend with a heart (and smile) bigger than Texas. We all miss him!
Tracy Dieterich
September 27, 2020
I met Mark through my daughter and late son-in-law Laura and Tommy Mudd. He always had a smile on his face. When Tommy passed away, Mark and Debra came over to my daughter’s home because Mark felt so sad form my grandson and wanted to bring him his collection of baseball cards to cheer him up. That touched my heart. He was a very caring, kind man. My prayers are with Debra and the family. Hold on to your loving memories.
Betty Duoto
September 26, 2020
Bigger than Life !
What a kind gentle soul ...
May God bless you and your family
Beatrice Bornibus
September 26, 2020
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