Dr. Leon Roggenbuck
Originally from Harbor Beach, Dr. Leon Roggenbuck joined the practice in 1992 after graduating from Michigan State University. He and his wife Amy are raising two children, Ethan and Emma. They reside in the area. Leon works primarily with dairy management. He enjoys being outdoors hunting. Leon is a member of the Knights of Columbus and the Sanilac County Right to Life Chapter.

Dr. Jarrett Gordon
Dr. Jarrett Gordon joined the practice in 1996 after graduating from Michigan State University’s College of Veterinary Medicine. He and his wife Bethany live in the Snover area with their four children Sam, Cassie, Susie and Benjamin. His primary focus is in dairy production medicine and surgery. Jarrett enjoys all outdoor activities, especially hunting and camping with the children. He also enjoys yard work and carpentry.

Dr. Ann Roberts
Dr. Ann Roberts, companion animal veterinarian, joined the practice in 2007. Originally from Waterford, Michigan, Ann graduated from Michigan State University in 1999. She and her husband Chuck practiced Veterinary Medicine in Twin Bridges Montana before coming to Deckerville. Dr. Ann enjoys internal medicine, and surgeries. Ann and Chuck reside in the Deckerville area with their two daughters, Alexa and Emma. In her spare time she enjoys the many animals on their farm, reading, outdoor activities and of course the kids.

Dr. Chuck Roberts
Dr. Chuck Roberts joined the practice in 2007. Originally from Deckerville, Chuck graduated from Michigan State University in 1999. He practiced Veterinary Medicine in Twin Bridges Montana before returning to Deckerville. Dr. Chuck’s background includes working with bovine and on occasion companion animals. He and his wife, Dr. Ann Roberts reside in the Deckerville area with their two daughters, Alexa and Emma.

Dr. Chad Vogel
Dr. Chad Vogel joined the clinic in 2007 following graduation from Michigan State University.

Originally from Deckerville, Chad and his wife Leslie reside in the area with their children Owen, Allison, Gage and Ty.
Dr. Vogel is a dairy practitioner that also has his own dairy farm.

Dr. Monya Vaughn
Dr.Vaughn, a companion animal veterinarian, grew up in Port Sanilac, MI. She was an animal lover from a young age growing up riding horses. She rode a variety of disciplines but focused on western all around showing in APHA. She attended the University of Findlay for her undergraduate and studied business and equine science. During her undergraduate studies she worked training Quarter Horses and Paints in all around western disciplines. Prior to veterinary school, she completed an internship at the University of Findley’s Western Equestrian center assisting in farm management. After veterinary school she completed a rotating veterinary internship at Conley and Koontz Equine Hospital near Fort Wayne, IN. Dr. Vaughn now resides in Port Sanilac, MI with her husband and daughter. Her veterinary interests include lameness, reproduction, wound management and dentistry. In her free time, she enjoys outdoor activities, such as riding, sailing, hiking and camping.



Dr. Kevin Vaughn
Dr. Vaughn joined the Thumb Veterinary Services’ team in the fall of 2015. Kevin graduated from Iowa State University College of Veterinary Medicine, where he met his lovely wife Monya (also a veterinarian at the practice). Having grown up in upstate New York’s dairy heartland, Kevin is very comfortable calling the Thumb home. With two prior years of experience in companion animal medicine, Kevin is eager to focus on companion animal internal medicine, dentistry, and preventative care; in addition to equine ambulatory work. Kevin enjoys competing in triathlons, brewing, and winter sports. Kevin and his wife have two horses, two cats, and two dogs.


Dr. Bryan Eyerly

Bryan graduated veterinary school from The Ohio State University in May 2019. He grew up in a small town outside of Mansfield Ohio and attended the University of Findlay for his undergraduate degree. At the University of Findlay he majored in Animal Science and Biology. He was also involved with their lowline Angus show team and served as a student barn manager for the animal science barns. Growing up, Bryan was actively involved in sports and 4H. He raised and showed beef cows with his brother. They have since sold all of the cows and now have a small flock of sheep. Bryan’s veterinary interests include reproduction and advanced reproductive techniques as well as dairy production and medicine. In his free time Bryan enjoys spending time with his wife, Victoria and son, Carson. He also enjoys hunting, fishing, and woodworking. Bryan looks forward to beginning his career with Thumb Veterinary Services. He is excited to meet and get to know everyone.

Dr. Lauren Lauwers

Lauren graduated from Michigan State University College of Veterinary Medicine in 2018. She spent her first year practicing food animal medicine in Central Valley California working mostly with dairies and beef ranches. She is excited to return home to the Thumb of Michigan where her family farms wheat, soy, corn, hay and raises lamb and steers. She enjoys the outdoors, musicals and spending time with her family. 



Dr. Gianna Covelli

Dr. Gianna Covelli is originally from Charleston, West Virginia. She is a recent graduate from Mississippi State University College of Veterinary Medicine. She now lives in Richmond, Michigan with her boyfriend who will be doing a surgical residency at Mclaren Macomb in Mount Clemens. Dr. Gianna has two shetland sheepdogs, Gracie and Taylor, who rule the roost. She has an interest in both companion animal and equine medicine, and her specific areas of interest include preventive care, surgery and internal medicine. In her spare time Dr. Gianna enjoys spending time with family and friends, kayaking, traveling, and going to the beach.