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Olivia Mac, MD, is double board certified in general surgery and surgical critical care. 

Dr. Mac grew up in the suburbs of Los Angeles County and attended medical school at the Medical College of Wisconsin in Milwaukee. After medical school, she returned to California to complete her general surgery residency at Arrowhead Regional Medical Center/Kaiser Permanente Fontana and then a surgical critical care fellowship at Arrowhead Regional Medical Center. 

Dr. Mac became a surgeon so that she could use her skills to help others, as surgeons in the past have helped those in her family. 

In her free time outside of the office, Dr. Mac enjoys baking, playing the piano, and playing with her cats.

She looks forward to welcoming both new and returning patients to Murrieta Valley Surgery Associates.

Xiujie Wang, MD, FACS, RPVI, is a board-certified vascular surgeon at Murrieta Valley Surgery Associates.

Dr. Wang studied at Shanxi Medical University in Jinzhong, China, earning her medical degree. After graduation, she moved to the United States and completed a surgical residency at St. Mary’s Hospital in Waterbury, Connecticut. She also completed a vascular surgery fellowship at the Icahn School of Medicine at Mount Sinai in New York City.

Dr. Wang brings more than 20 years of vascular surgery experience to the practice. She treats a wide array of conditions but has a special interest in treating peripheral artery disease (PAD), varicose veins, and aneurysms. 

Outside of the office, Dr. Wang holds appointments at several area hospitals, including Inland Valley Regional Medical Center; Rancho Springs Medical Center and Loma Linda University Medical Center; and Temecula Valley Hospital.

Dr. Wang is board-certified in general and vascular surgery by the American Board of Surgery. She’s also a fellow of the American College of Surgeons and a member of the Society of Vascular Surgery and the American Venous Forum.

Dr. Wang welcomes anyone in need of vascular surgery to Murrieta Valley Surgery Associates today. 

Raymund Cordero, MD, is a skilled, dedicated, and board-certified doctor of medicine specializing in general surgery and has been practicing locally for over 20 years. 

In addition to his work at Murrieta Valley Surgery Associates, Dr. Cordero also holds appointments at Inland Valley Regional Medical Center, Rancho Springs Medical Center, Loma Linda University Medical Center Murrieta, Temecula Valley Hospital, and Menifee Valley Hospital. 

Dr. Cordero is a member of the American College of Surgeons (ACS), the American Society of Breast Surgeons (ASBrS), and the Society of Laparoendoscopic Surgeons (SLS). He is certified by the American Board of Surgery (ABS).

When Dr. Cordero isn’t serving patients, he likes watching basketball and soccer. He also enjoys spending time with his two children, who are both interested in pursuing medicine.

Francis Essien, MD, FACS, is a board-certified general surgeon and fellowship trained in minimally invasive and bariatric surgery.

Dr. Essien's zeal for the art and science of medicine and surgery began as a teenager at the University of Ibadan in Nigeria.

An interest in providing excellent patient care brought Dr. Essien to the United States to pursue a natural calling in the surgical specialty.

Passionate about cutting-edge, advanced, minimally invasive, and robotic surgical technology, Dr. Essien’s knowledge and expertise give patients the advantage of a faster recovery. 

The surgeon’s more cosmetic approach also offers less pain and a quicker return to a happier and more productive lifestyle.

Dr. Essien is highly skilled in various procedures, most frequently performing laparoscopic surgery for severe gastroesophageal reflux disease, laparoscopic hernia repairs, hiatal hernia repairs, minimally invasive endocrine surgery, laparoscopic adrenalectomy, and laparoscopic colon resections for benign and malignant conditions.

Dr. Essien also performs laparoscopic sleeve gastrectomy, laparoscopic gastric bypass, and revision bariatric procedures.

With a passion for Bariatric surgery, Dr. Essien helps patients achieve their goals of a healthier weight while eliminating the medical illnesses associated with excessive weight and enjoying a better quality of life.

Dr. Essien believes in an individualized and holistic approach to improving the health and wellness of patients.

Outside of caring for patients, Dr. Essien enjoys spending time with family at home, cooking, traveling, cycling, and playing golf.

Book an appointment with Dr. Essien, MD here.

Amit Karmur, DO, is the newest vascular surgeon to join Murrieta Valley Surgery Associates (MVSA).

Dr. Karmur graduated from medical school at the Western University of Health Sciences and completed his general surgery residency at Community Memorial Health System in Ventura, California. He then went on to sub-specialize and complete his fellowship in vascular surgery at Harbor-UCLA Medical Center.

Dr. Karmur treats all types of diseases that affect the vascular system. He specializes in both traditional open surgical and minimally invasive endovascular techniques. These include diseases of the carotid arteries, aortic aneurysms, peripheral arterial disease, and dialysis access.

During his spare time, Dr. Karmur likes to travel and learn about new cultures. He also enjoys maintaining his health by working out and staying active by exploring the outdoors. He and his wife are both from the Inland Empire and are excited to be back in the community.

Hege Johnsen, MD, FACS, is a board-certified general surgeon at Murrieta Valley Surgery Associates, providing complete surgical care to patients in Wildomar, Temecula, Hemet, and Menifee, California.

Dr. Johnsen studied at Albert Szent-Gyorgi Medical University in Szeged, Hungary, earning her medical degree. She then moved to the United States and completed a residency in general surgery.

Dr. Johnsen brings more than 20 years of experience to the practice. She specializes in general surgery but has a special interest in breast surgery and inguinal hernia repair without mesh (shouldice procedure).

Outside of Murrieta Valley Surgery Associates, Dr. Johnsen holds appointments at several area hospitals, including Inland Valley Regional Medical Center in Wildomar, California; Rancho Springs Medical Center in Murrieta, California; Menifee Valley Hospital in Menifee, California; and Temecula Valley Hospital in Temecula, California; and Loma Linda University Medical Center. 

Dr. Johnsen is board-certified by the American Board of Surgery and is a Fellow of the American College of Surgeons. She speaks English and Norwegian fluently, allowing her to serve the practice’s diverse clientele. 

Dr. Johnsen welcomes anyone needing general, breast surgery, hernia repair or cholecystectomy to Murrieta Valley Surgery Associates today. 

Dr. Ghobrial is a Board Certified General Surgeon. He has over 20 years of experience in trauma, critical care and general surgery, with a special interest in advanced laparoscopic procedures. He is a highly skilled physician who utilizes the most advanced techniques and technology available today, such as Robotic Assisted Hernia Repair, to ensure the best surgical outcome for each patient. Gergis Ghobrial, MD, is certified by the American Board of Surgery and is a Fellow of the Royal College of Surgeons in Ireland. He has been in private practice in Southern California since 1997. He is an active member at Long Beach Memorial Medical Center where he served as Chief of Surgery and is a member of the Board of Trustees.

About Dr. Fischer

Trevan Fischer, MD, FACS, specializes in complex general surgical oncology and is certified by the American Board of Surgery. Dr. Fischer is an experienced surgeon who offers patients in Santa Monica, Los Angeles, Fullerton, and Orange, California, the latest surgical techniques, including minimally invasive surgeries, to help in the battle against cancer. His thorough understanding of the nature of cancer allows him to perform complex surgeries that help him diagnose and treat a number of conditions, including breast cancer, skin cancers, and soft tissue sarcomas.

Outside of his private practice, Dr. Fischer continually strives to stay on top of the latest techniques in treating cancer, and he’s involved with innovative clinical trials at the Saint John's Cancer Institute (formerly John Wayne Cancer Institute) in Santa Monica. He also serves as an assistant program director of the Donald L. Morton, MD Complex General Surgical Oncology Fellowship program at the Institute.

Dr. Fischer began his medical career at the University of Oklahoma in Oklahoma City, where he earned his medical degree in 2008. He completed his general surgery residency at the University of Florida in Gainesville in 2015, serving as chief resident from 2014-2015. In 2015, Dr. Fischer became a fellow at the John Wayne Cancer Institute, where he completed two years of specialized surgical oncology training. 

To continue his education, Dr. Fischer is a member of the Society of Surgical Oncology, the American College of Surgeons, and the American Medical Association.

Over the course of his career, Dr. Fischer’s involvement in research and clinical trials has led to numerous articles, papers, and presentations in peer-reviewed publications and at national conferences.

Dr. Fischer is constantly exploring new ways to gain the upper hand on cancer through state-of-the-art surgical techniques and brings this experience to the Southern California area. He also accepts patients across all of Southern California, including Bakersfield, San Luis Obispo and Palm Springs. 

Dr. Fischer now has expanded his practice to Orange County and sees patients at both Providence St. Joseph and St. Jude. 

Donald Hastie, BC-FNP, is a highly experienced family physician at Genesis Surgery Center, with locations in Santa Ana and Foothill Ranch, California. With an impressive career spanning 25 years, Dr. Hastie has dedicated his life to providing exceptional medical care to his patients.

Dr. Hastie completed his undergraduate studies at Brigham Young University in Provo, Utah, in 1976. He then pursued further education at the University of Phoenix in Arizona, earning degrees in 1985 and 1989. His commitment to excellence in healthcare led him to the University of Utah in Salt Lake City, where he graduated in 1999.

Patients consistently praise Dr. Hastie for his extensive medical knowledge and compassionate approach. His blend of expertise and empathy makes him a trusted and beloved physician in his community. Whether you're seeking routine family care or specialized treatment, Dr. Hastie is committed to ensuring the well-being of his patients at Genesis Surgery Center in Santa Ana and Foothill Ranch, California.

Y.H. Salem, MD, FACS, runs a state-of-the-art medical practice specializing in vascular surgery, acid reflux surgery, and general surgery, at his offices in Huntington Beach, Foothill Ranch, and Anaheim, California.

With over 20 years of professional experience under his belt, he leads a friendly staff and employs cutting-edge technology to provide cosmetic and health benefits to patients dealing with varicose veins and spider veins stemming from a variety of causes.

At the practice’s warm, welcoming offices, they provide a host of innovative treatments for vascular disease, including ultrasound-guided procedures, injections, and laser treatments. Dr. Salem always takes considerable effort to minimize any scarring following medical procedures and maintains constant monitoring to evaluate the progress of his patients through recovery. They’re also highly skilled when it comes to providing surgical treatment for many other conditions, such as intestinal obstructions, lipomas, gallstones, and appendicitis.

One of the central tenets of Dr. Salem’s care is spending as much time as possible with each patient to develop individualized treatment plans and to allow time for addressing questions and concerns. Patient education is also essential and foundational to the practice’s overall approach to care, as Dr. Salem and the staff help each patient understand everything about their condition and treatment options.

If you’d like to schedule an appointment with Dr. Salem to learn more about the practice and what it can offer you, call or use the online booking tool today.