Platinum Team

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Dr. Riva RahlRiva Rahl, MD
Platinum Medical Director

Board Certification: Internal Medicine, Emergency Medicine & Lifestyle Medicine

Read Dr. Rahl's Bio

Kimulique (Kim) Allen, MDKimulique (Kim) Allen, MD
Platinum Physician

Board Certification: Internal Medicine

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Michael Chapman, MDMichael Chapman, MD
Platinum Physician

Board Certification: Family Medicine

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Emily Hebert, MD
Platinum Physician

Board Certification: Internal Medicine

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Steven Lilly, MD, MBASteven Lilly, MD, MBA
Platinum Physician

Board Certification: Internal Medicine

Read Dr. Lilly's Bio

Roni Gonzalez-DunnRoni Gonzalez-Dunn
Platinum Executive Director

Roni joined Cooper Clinic in 1990 after graduating from Kansas State University with a Bachelor of Science in Exercise Science. She began as a Clinical Exercise Physiologist and was later named Senior Clinical Administrator before spearheading the development of Platinum. Her extensive knowledge of the Clinic is an invaluable asset to the Platinum team. Roni and her husband, Rick, have two daughters.

Rhett SaguiRhett Sagui
Patient Advocate to Dr. Rahl

With more than 15 years of experience in the medical field, Rhett joined Cooper Clinic in 2014 as the Cardiology Administrative Assistant and Phlebotomy Technician and Platinum in 2020. Prior to joining Cooper, he served as an EMT/Firefighter where he worked with an interagency “Hot Shot” crew fighting wildfires in the Western United States. Rhett is certified as a medical assistant and instructor for the American Heart Association Basic Life Support CPR classes. He enjoys traveling with his wife, Tandra, and their four children.

Brandi VasquezBrandi Vasquez
Patient Advocate to Dr. Allen

Brandi joined the Cooper Clinic Platinum team in 2024. A certified Medical Assistant with more than 15 years of experience, she is currently pursuing an associate's degree in science and nursing. Brandi and her husband spend much of their free time traveling to watch their kids participate in sports. They also enjoy spending time outdoors and playing board games with her family.

Donna AvenDonna Aven
Patient Advocate to Dr. Hebert

With more than 24 years of experience in health care as a medical assistant, Donna joined the Platinum team in 2022. She previously worked in Cooper Clinic as a medical administrative assistant and is an ACE Certified Personal Trainer and Fitness Nutrition Specialist. Donna and her husband have led the youth and children’s program at their church for the past 10 years. She enjoys being active while spending time with her two granddaughters and helping others with their health journey.

Susan RichardsSusan Richards
Patient Advocate to Dr. Lilly

With 15-plus years in health care—from administrative to medical technician—Susan joined the Platinum team in 2021. She previously worked in Cooper Clinic's billing department for five years and has a degree in business administration. Susan and her husband spend much of their free time traveling to watch their daughters play competitive soccer.

Zoe SamaniegoZoe Samaniego
Administrative Assistant

Zoe joined Cooper Clinic Platinum with more than three years of experience serving patients at the Cooper Clinic front desk. Prior to that, she was a sales associate at The Coop, Cooper Fitness Center’s retail boutique. Zoe graduated from Texas Tech University with a bachelor’s degree in Communication Studies and a minor in Media Strategies. While in college she served as the president of the Texas Tech hip hop dance team, Dancers with Soul. In her spare time, Zoe enjoys daily exercise, watching movies and traveling with her friends.

Office Hours:
8 a.m.-4 p.m.

During office hours, please call the office first.

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Cooper Clinic Platinum
12200 Preston Road
Suite 102
Dallas, TX 75230
866.906.2667 (COOP)
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