Meet Our Expert Team

Dr. Kory Stassi is a proud native of Bethalto, Illinois, where he graduated from Civic Memorial High School in 2007. Throughout his schooling in Bethalto, Dr. Kory was actively involved in both academic and athletic pursuits. He began his higher education at Lindenwood University, where he was a notable member of the shooting team, achieving both team and individual national championships.

Dr. Kory completed his undergraduate studies in biology at Southern Illinois University - Edwardsville, then furthered his education at Logan University. There, he earned an additional bachelor’s degree in human biology and graduated with honors in 2015 as a Doctor of Chiropractic.

Today, Dr. Kory lives in Bethalto with his two daughters, Kolby and Kennedy, and remains deeply involved in his community.  Dedicated to his hometown, Dr. Kory aims to help residents live their fullest lives through preventative health and chiropractic wellness, promoting a healthy, enjoyable lifestyle for all his patients.

In 2023, Dr. Stassi began his TRT journey and was amazed by the results. Inspired by his own experience, he set out to create a clinic where others could benefit from the transformative effects of testosterone replacement therapy and peptide therapy. By 2024, the idea had taken shape, and in March 2025, Optimal Performance by Stassi became a reality. As the owner and operator, Dr. Stassi has built a team of top-tier providers and staff, dedicated to delivering the highest level of care and an unparalleled patient experience.

With over a decade of experience in healthcare, Felecia has been dedicated to providing compassionate and comprehensive healthcare since 2010. After earning her Nurse Practitioner certification in 2017, she has been focusing on helping patients achieve optimal health, both physically and emotionally.

Felecia has a strong foundation in nursing, having worked in a hospital and office setting prior to becoming a Nurse Practitioner. This diverse experience has shaped her holistic approach to patient care, allowing her to view health from a broad perspective and treat the whole person, not just their symptoms.

She believes that true wellness comes from feeling balanced from the inside out and takes a personalized approach to each patient's care. Her extensive knowledge, coupled with a deep compassion for others, enables her to build trusting relationships where patients feel heard, supported, and empowered to take charge of their health.

Tommi joined the Stassi team in August of 2017 and has played a vital role in ensuring the smooth operation of the office. With extensive experience in patient care and office management, Tommi handles day-to-day office activities, ensuring that both administrative and patient-related processes are efficiently managed. Her attention to detail and commitment to the team make her an essential part of the practice's success.

Graduating with a business degree from Eastern Illinois University, Tommi has developed a strong foundation in organizational skills and business management, which she applies daily in her role. Outside of work, she is a devoted mother to her two children, Noah and Bella, and wife to Jacob. She has a passion for reading, traveling, and spending quality time with her family. With a dedication to both her professional and personal life, Tommi ensures that Optimal Performance by Stassi and Stassi Chiropractic runs smoothly and that patients and staff have a positive and efficient experience.