Meet the Team at Synergy Integrated Healthcare

Cat Simonson – Front Desk Coordinator

Cat brings many years of experience in customer relations and quickly felt at home among the friendly, caring staff. She enjoys being the first point of contact for our patients, helping meet diverse needs and forging real connections.

Cat’s favorite aspect of her role is the positive team culture and the opportunity to truly get to know each patient beyond their symptoms. She believes the supportive teamwork among staff makes the office feel like family.

Outside the office, Cat and her boyfriend love traveling, working on home projects, and relaxing with their puppy, Laika. Cat finds it especially rewarding to see patients arrive in discomfort but leave feeling better.

Alisha Jones – Nurse Practitioner | Regenerative & Functional Medicine

Alisha Jones, FNP-C, is a board-certified Family Nurse Practitioner whose passion for whole-person healing led her to the integrative model at Synergy Integrated Healthcare. With a clinical background spanning patient-centered care, functional and integrative medicine, hormone optimization, peptide therapy, IV therapy, and regenerative wellness, she brings both traditional medical training and a forward-thinking approach to every patient interaction.

At the practice, Alisha focuses on helping patients understand their treatment options and navigate the path forward with confidence. She is especially passionate about regenerative therapies, including PRP and cellular-based treatments, and finds deep fulfillment in watching patients regain mobility, hope, and quality of life after dealing with chronic pain or injury.

Alisha approaches care with a whole-person philosophy, building personalized, evidence-informed plans that address the root of a patient’s condition rather than simply managing symptoms.

Outside the clinic, she enjoys spending time with her family, growing in her faith, and exploring everyday approaches to wellness. She values meaningful connection, personal growth, and maintaining balance across all areas of life.

Dr. Khaled Hassan, MD – Regenerative Medicine Physician

Dr. Hassan brings more than 25 years of medical experience to the team. He completed his internship at Dhaka Medical College and his internal medicine residency at Forest Park Hospital in St. Louis, with additional training at the Texas Heart Institute in Houston.

He specializes in regenerative medicine, including cell-based procedures, exosome therapy, PRP, and advanced spine injections. Dr. Hassan also supports patients with joint issues, hormone imbalances, weight loss, facial rejuvenation, and GAINSWave care for ED. Outside the office, he enjoys family time, research, and public speaking.

Justin Sprengel – Marketing Coordinator

Justin has always enjoyed connecting with people and using his considerable array of communication skills to help others build valuable relationships and opportunities. He’s particularly passionate about promoting fun, impactful events and worthwhile causes that bring people together and create positive experiences.

To prepare for his career, he earned his degree in Communications with a specialization in Marketing and Promotions from Saint Louis University.

For Justin, the most fulfilling aspect of his job is cultivating meaningful connections, expanding networks, and helping spread the word about the value the practice brings to our clients and partners. Creating opportunities and bridging gaps to make connections easier and more impactful is one of the most rewarding parts of what he does every day.

Outside the office, Justin is a big St. Louis sports fan with a deep loyalty to the Cardinals and Blues. He loves live music, exploring new destinations, and unwinding with a good beer or bourbon, with a particular weakness for warm-weather getaways to the Caribbean.

Jamie Rivers – Co-Owner

Jamie spent over 13 years playing professional hockey in the NHL, which gave him a firsthand understanding of what it feels like to battle injuries and work hard just to keep your body functioning. After his playing career, he launched several business ventures and threw himself into health and wellness, exploring what it really takes to feel good every day and helping others experience that too.

That journey led him to Synergy Integrated Healthcare co-owner Dr. Ashley Vogt, whose approach to non-surgical care genuinely changed the way Jamie thought about what’s possible. Seeing the results she was able to achieve for patients made him want to get involved and help spread the word.

Now as co-owner, Jamie focuses on marketing and community outreach, bringing the same energy and commitment he had on the ice to making sure people in the Chesterfield area know there’s another way forward. “Being able to see progress in our patients is very gratifying. And to see them smiling when talking about the services we have provided them is priceless to us.” He finds it rewarding to help people every day.

When he’s not working, Jamie is happiest near the water, whether that’s out at the lake or relaxing by the pool at home. Those quiet moments are his favorite way to unwind and recharge.

Toby Simers, LPC

Bio Coming Soon

Meet the Team at Synergy Integrated Healthcare | (314) 200-4955