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.

    William Trusnovic

    MD // Medical Director & CEO

    William “Bill” Trusnovic is a native of Washington PA, but has lived and practiced medicine in various locations throughout the United States. He attended and graduated from the University of Pittsburgh, School of Medicine in 1989, having received a full scholarship from the United States Navy. After his internship at the US Naval Hospital, Oakland CA, Dr. Trusnovic served with the United States Marine Corps, First Marine Division as Battalion Surgeon.After military service, Dr. Trusnovic attended his residency program at Allegheny General Hospital, and later became Board Certified in Emergency Medicine.In recent years, Dr. Trusnovic has found a passion for medical aesthetics.  With his passion and eye for aesthetics, he has already branched out into multiple practices that include neurotoxins, fillers, and PRP with microneedling.In addition to his medical degree, Dr. Trusnovic attained his Juris Doctor from the University of Pittsburgh, School of Law in 2008 and has successfully passed the Pennsylvania Bar Examination.

      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.