About Us


Our mission is to provide services personalized to each client to enhance their natural beauty in a safe and relaxed environment. Each consult and procedure is client focused whereas both provider and client work in conjunction. A global approach is used to make sure the client is fully educated and that every client goes home with the education to maintain the successes achieved at XO Medical Spa.  We strive to give our clients a renewed sense of self by allowing them to look as good as they feel and feel as good as they look.

Khanh Nguyen

FNP-C MSN // Lead Provider & President

Khanh Nguyen, comes to XO|MS with close to a decade in adult medicine, hospital management, and medical aesthetics. His history started with a degree in chemistry and then eventually branching to a master’s and nurse practitioner degree.

With a primary focus in adult medicine and working with the under-served Asian population, he wanted to incorporate his passion for art and fashion into the world of medicine. Having owned a brand promotion company for over four years and working with the largest fashion houses, he found medical aesthetics, a profession that allowed him to blend his love for both art and medicine.

Because of these traits, he sees each client as an individual and works with what their goals are. His specialties include Asian facial contouring, male aesthetics, and a mastery in neurotoxins, fillers, PDO threads, and multi-modality lasers.

​In 2020 Khanh was awarded Top Nova Threads Practitioner in San Diego and Top 3 practitioners in Orange County.

    John D. Smoot

    MD-FACS // Medical Director & CEO

    During his 30 years as a Board Certified Plastic Surgeon, John D. Smoot, MD, FACS has earned a reputation for providing excellent care and beautiful cosmetic surgery results.

    With each patient and procedure, he focuses on achieving proportion and balance. His goal is not to create the most dramatic change possible, but to refine a patient’s overall appearance with results that look completely effortless, complementing a patient’s natural aesthetic.

      Cheyenne Rubens

      Brand Manager

      Cheyenne was born and raised in San Diego.  She has spent the last several years working in the health and wellness industry.  She has assisted practices with operations, client coordination, and marketing.  Cheyenne is also a Certified Holistic Nutritionist and has a passion for integrating culinary arts with optimal wellness.  With her extensive history in social media and branding, she played a big part in developing XO Medical Spa's branding and image.  As a Graphic Designer - she creates Xo's branded content  and runs all social channels.