Our Team

Lead Provider

Matthew A. Schafer brings a wealth of experience to the world of men's health. With over 15 years of frontline medical service as an EMT and paramedic, Matthew has a strong foundation in emergency care and acute medical response. He earned his Master of Physician Assistant Studies from Rocky Mountain University of Health Professions in Provo, UT, and has since expanded his focus to include advanced men's wellness. His practice offers expertise in testosterone replacement therapy, erectile dysfunction, and aesthetic treatments. A native of Los Angeles County, he is deeply connected to the communities he serves and values building meaningful relationships with each patient. When he's not in the clinic, Matthew enjoys exploring the outdoors through camping, road trips, and international travel.

Medical Director

Medical Board of California Certification, DEA, NPI

David A. Nyberg, M.D. brings over 40 years of medical expertise to Ultimate Male, with a distinguished background in diagnostic imaging and precision medicine. As a leading physician, he now focuses on applying advanced diagnostic insights to support men’s health, hormone optimization, and longevity care. His extensive clinical experience and academic contributions—including authoring multiple medical textbooks and 150+ publications—enhance our commitment to delivering evidence-based, high-quality wellness care for every patient.

Lead Aesthetic Nurse

Helena Xin is a master's-prepared registered nurse, graduating from Western University of Health Sciences with a robust foundation in both acute and aesthetic care. With extensive experience in the intensive care unit (ICU), Helena has honed her clinical skills in managing critically ill patients, demonstrating her commitment to precision, empathy, and patient-centered care. In the aesthetic field, Helena has further specialized as a certified aesthetic nurse injector, focusing on regenerative injectables, rejuvenation laser treatments, and bioidentical hormone replacement therapy. Her approach prioritizes individualized, results-oriented care, ensuring that each client feels valued and heard throughout their treatment journey. By actively listening to her clients' needs and concerns, Helena creates tailored treatment plans that enhance their confidence and well-being. With a dedication to exceptional customer service and a passion for advancing patient health, Helena is an invaluable resource in both aesthetic and critical care nursing, continually striving to exceed expectations and provide a positive experience for all her patients.

Aesthetic Nurse

Sabrina is a highly trained aesthetic nurse with over five years of dedicated experience in medical aesthetics. From the very start of her nursing career, she has focused exclusively on aesthetic medicine, combining advanced clinical knowledge with a refined artistic sensibility to deliver results that are both natural and transformative.

Her areas of expertise include full facial balancing, customized lip augmentation, and precision-based neurotoxin techniques for anti-aging and facial rejuvenation. Sabrina approaches each patient with a tailored strategy, grounded in anatomical harmony and guided by the individual’s unique goals and facial structure.

With a strong belief that aesthetic care should never be one-size-fits-all, Sabrina is committed to providing fully personalized treatment plans. She takes the time to listen, assess, and educate, ensuring that every patient receives safe, evidence-based recommendations that align with their preferences while achieving optimal, natural-looking outcomes.

Known for her meticulous technique, clinical integrity, and eye for detail, Sabrina is deeply trusted by her patients to deliver consistent, high-quality results in a welcoming and professional environment.

Aesthetic Nurse

With over seven years of nursing experience—including a strong foundation in critical care—I bring medical expertise and a true passion for aesthetics to every client I serve. Licensed in Washington, Oregon, and California, I specialize in helping people not only look their best, but feel their best. From advanced procedures like Botox, fillers, mesotherapy, IV drips, PRP, and laser treatments to testosterone replacement therapy and Erectile dysfunction solutions, I offer personalized care that blends science, artistry, and confidence-building. Whether you’re looking to refresh your appearance or unlock peak performance and libido, I’m here to help you feel powerful, youthful, and unapologetically confident.