Tree Shepherds Family

Scott Geer 

Founder / Principal, Master Certified Arborist

Scott Geer has a passion for trees that goes back to his academic training in Forestry and Forest Entomology. With a Bachelor degree in Forestry and a Masters in Forest Entomology from Stephen F. Austin State University, Scott went to work as a forester for a small lumber company in Woodville, Texas and then the U.S. Forest Service in Alexandria, Louisiana.

Scott began a 28 year career in the rapidly expanding information technology I/T industry in 1980 working for IBM for 18 years along with other smaller companies. While working in the I/T industry, Scott stayed current on trends in natural resources management and in 2007 decided to return to his first love. He gained his Arborist certification in early 2008 and has been working as a fulltime Arborist since then.

Scott brings a wealth of business and technical experience to his passion for trees in the urban landscape. He is a member and is certified as an Arborist by the International Society of Arboriculture (ISA) and is a graduate of the American Society of Consulting Arborists (ASCA) Academy.

Scott is currently the owner of, and principal consulting arborist for Tree Shepherds. Tree Shepherds is focused on the long term health and beauty of their client’s trees and provides a full suite of arboriculture consulting services. Scott and his wife, Noreen, have raised six children in Lewisville, Texas and continue to reside in that community.

Scott can be reached at 972-317-9598 or

Clayton Geer 

Owner / Arborist & Climber

Clayton, alongside Scott, started Tree Shepherd’s tree surgery department in 2011 and is now the Chief Operations Officer.  Over the years he has developed a solid understanding of trees.  Clayton still greatly enjoys climbing in the canopy of a tree and applying the art and science of tree pruning.  He also takes care of all the equipment and enjoys keeping everything running.  You will see find him working on the crews and proposing estimates to customers.

In 2016 Clayton completed his BS in Mechanical engineering from the University of North Texas. Clayton has one 6-year-old son. In his free time, he enjoys playing basketball, snowboarding, and anything else athletic.  Clayton also loves to build and create things with his hands.

Stan Williams

Certified Arborist

Stan loves climbing trees! When he began in the tree care industry in 2012, he took to the trees like a squirrel and never looked down. Climbing is one of his favorite topics, so if you’re interested in climbing trees, give him a call!

Stan is also an ISA certified arborist and has been with Tree Shepherds for 2 years. You will find him as a crew leader, tree climber, or giving an estimate. He and his wife Christy have 2 kids and live in Garland, Texas.

Kim Sterenberg

Customer Support

Kim Sterenberg has been with Tree Shepherds since January of 2014, directing day-to-day operations of the business, overseeing customer support, and the scheduling of work for customers and employees. She and her husband moved to Texas after Kim's husband completed his studies at the University of Northern Iowa (UNI), Kim also graduated from UNI with a Bachelors degree in Communication. Since the move to Texas Kim and her husband have raised 5 sons and enjoy spending most of their free time with their children and grandchildren. Kim is the first voice that our clients hear when they make a call. She looks forward to your call!

Joe Lawton

Arborist & Climber

Joe began his Arborist career in the summer of 2016 after leaving the world of IT (he got bored sitting down all day long).  He graduated from Texas A&M with a BBA in Accounting and a MS in Management.  Joe enjoys unicycling, juggling, and occasionally doing both at the same time.  He is currently working on becoming a Firefighter in North Texas, and will still climb trees and play in the dirt on his days off.

Austin Mago

Arborist & Climber

Austin is a California native who transplanted to TX in 2015 shortly after marrying his college sweetheart in the fall of 2014.

Austin lives in Grapevine TX where he and his wife love to be engaged in the local small-town community. Some of Austin’s biggest passions are hunting, fishing, and the outdoors. His all-time favorite hobby is building his own archery tackle from natural materials. From wooden bows and arrows to everything in between, there isn’t a single aspect of archery that Austin doesn’t have an intimate knowledge and understanding of.

Ethan Geer 

Owner / Business Manager

Ethan Geer has been with Tree Shepherds since December of 2013. He began in the office answering phone calls and can now do everything from bookkeeping, marketing and other back end stuff to working as a ground man and stump grinding. He is one of Scott's sons and became an owner in January of 2018.

He loves to play basketball, ping pong, piano, and board games. He and his wife Morgan have a passion for foster care and became licensed as foster parents in December 2017.

Ethan also has a bachelor’s in Entrepreneurship from the University of north Texas, and an associate’s in music from Collin College. You may occasionally see him at a networking event, or on a crew. If you need him, feel free to ask for him at the Tree Shepherd's phone number!

John Pinney


John Pinney is on his 3rd year with the company as a top tier ground guy and beginning climber. He married his beautiful English Bride in the spring of 2018 and has traveled the globe with her on his time off.

John has a passion for people and loves to educate anyone who shows interest in a myriad of topics. John’s personal hobbies include sailing, hunting, camping, backpacking, climbing, and traveling!

Aaron Ellis

Arborist & Climber

A tree once provided solace to Aaron as he scrambled up into the branches to escape an irritable canine. Thus began Aaron’s love for trees. Each time Aaron is on a job he is inspired by that day to create masterpieces out of each tree he prunes.

With over 3 years training under the eye of a certified arborist, Aaron provides his skills to enhance the beauty of clients’ trees and help them grow into what they were meant to be.

Aaron is also talented at sketching, chess, and piano in his free time. Our clients can look for Aaron on a crew!

Joseph Sansoucie


Joseph Started with Tree Shepherds in April 2019 because he was seeking practical experience in the green industry to balance out his Associate degree in Horticultural Science. He is focused on learning as much as he can in all aspects of the business and has set his sights on becoming an arborist.  

He likes competitive sports & games, music, dancing,  planning for the future, wellness, and nature.

You can find him on the crews as one of our ground men and sometimes in the plant health care department.

Tiana George

Arborist & Climber

Tiana started working for the company after raising eyebrows at the annual ISA Tree Climbing Competition where she was one of just three ladies to compete.

She got her foot in the door through climbing, but her real passion for trees is in plant health care and diagnosis.

She is currently studying horticulture and helping Tree Shepherds develop the plant health care side of the business. You'll see her on both the tree surgery and plant health care crews and tagging along on consultations.

Areas We Serve

We are based in Highland Village, Texas and primarily serve Denton County and the North DFW areas: Argyle, Bartonville, Carrollton, Copper Canyon, Corinth, Denton, Double Oak, Farmers Branch, Flower Mound, Frisco, Justin, Krum, Lake Dallas, Lewisville, Ponder, Roanoke, Sanger, Shady Shores, and The Colony

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