I am committed to providing the highest level of quality and compassion in surgical care to the residents of Ventura County. I offer the most evidence-based and modern surgical techniques available in order to provide superior care and achieve better outcomes for my patients. Furthermore, I am dedicated to providing a patient-centered care experience that enables each patient to make a well-informed decision about their care. Dr. Brand is rated as an Experienced provider by MediFind in the treatment of Congenital Diaphragmatic Hernia. Her top areas of expertise are Hernia, Peptic Ulcer, Necrosis, Gallbladder Removal, and Hernia Surgery.

Dr. Tuai attended Ohio State University, College of Medicine after he received his Undergraduate Degree in Biochemistry at UC Davis in 1992. He completed his general surgery residency at UC San Francisco/Fresno, where he spent a year as a clinical instructor in the Department of Surgery, before beginning a private practice in Chino. He joined the Group in December, 2004.Dr. Tuai is a Board Certified surgeon and a Fellow of the American College of Surgeons who has extensive experience with advanced laparoscopic and minimally invasive techniques including robotic surgery.Dr. Tuai's passion is minimally invasive surgeries, especially involving the colon, stomach, gall bladder, and hernias. He is fluent in Mandarin Chinese and Korean.Offers high-quality, individualized care with compassion. Believes communication and collaboration with patients is the foundation for effective relationships. Through effective education, patients are empowered to partner in their care and achieve their health goals. Dr. Tuai is rated as an Advanced provider by MediFind in the treatment of Congenital Diaphragmatic Hernia. His top areas of expertise are Hernia, Gallstones, Choledocholithiasis, Hernia Surgery, and Ileostomy.

Patrick Mccarty is a General Surgeon in Oxnard, California. Dr. Mccarty is rated as an Advanced provider by MediFind in the treatment of Congenital Diaphragmatic Hernia. His top areas of expertise are Hernia, Gallstones, Choledocholithiasis, Gallbladder Removal, and Endoscopy. Dr. Mccarty is currently accepting new patients.

Dr. Micha Rojany was born and raised in Southern California. He received his undergraduate degree from the University of California, Berkeley. He attended USC Medical School and completed his internship and residency at Cedars-Sinai Medical Center in Los Angeles. His fellowship in Gastroenterology was completed at the University of California, Davis.Dr. Rojany has practiced in Ventura County since 2006 and is an active member of the local medical community and hospital staff at St. John's Regional Medical Center in Oxnard, and Pleasant Valley Hospital, in Camarillo. He enjoys practicing as a Gastroenterologist with special interests in inflammatory bowel disease and biliary tract diseases.As a Gastroenterologist, Dr. Rojany enjoys the depth and breadth of his field. He takes pride in providing excellent care while taking care of his patients and meeting their needs as a community specialist in digestive diseases. Dr. Rojany is rated as an Experienced provider by MediFind in the treatment of Congenital Diaphragmatic Hernia. His top areas of expertise are Familial Adenomatous Polyposis, Gastrointestinal Bleeding, Angiodysplasia of the Colon, Endoscopy, and Gastrectomy.

Dr. Karen Simon received her B.A. from Stanford University in 1996. She then attended Northwestern University for medical school. She completed her residency at Cedars-Sinai Medical Center in 2004 and her fellowship at UCLA and Cedars in 2008.Dr. Simon has proudly been serving patients in Ventura County since 2008 and is very involved in field research. Dr. Simon is also a speaker for Exact Sciences on behalf of Cologuard and is actively associated in research studies. She is a part of the Takeda Chloride Channel Council and a speaker for Amitiza, as well.She enjoys educating the doctors and the community as a lecturer on topics such as colorectal cancer screening at St. John's Hospital, where she is also a part of the Ethics Committee.Dr. Simon aims specifically to work with patients to discover the problem and develop a treatment strategy. She has a particular interest in Celiac Disease, Inflammatory Bowel Disease (IBD), and a passion for improving colorectal cancer detection.She is dedicated to developing a relationship with patients by utilizing education and mutual information sharing. Dr. Simon is rated as an Experienced provider by MediFind in the treatment of Congenital Diaphragmatic Hernia. Her top areas of expertise are Gastroesophageal Reflux Disease (GERD), Familial Adenomatous Polyposis, Painful Swallowing, Endoscopy, and Colonoscopy.

Offers high-quality, individualized care with compassion. Believes communication and collaboration with patients is the foundation for effective relationships. Through effective education, patients are empowered to partner in their care and achieve their health goals. Dr. Dixon is rated as an Experienced provider by MediFind in the treatment of Congenital Diaphragmatic Hernia. His top areas of expertise are Choledocholithiasis, Hernia, Breast Cancer, Hernia Surgery, and Colostomy.

Offers high-quality, individualized care with compassion. Believes communication and collaboration with patients is the foundation for effective relationships. Through effective education, patients are empowered to partner in their care and achieve their health goals. Dr. Lopresti is rated as an Experienced provider by MediFind in the treatment of Congenital Diaphragmatic Hernia. His top areas of expertise are Choledocholithiasis, Gallstones, Gallbladder Disease, Bladder Reconstruction, and Hernia Surgery.

Jay Guan is a Gastroenterologist in Camarillo, California. Dr. Guan is rated as an Experienced provider by MediFind in the treatment of Congenital Diaphragmatic Hernia. His top areas of expertise are Hemorrhoids, Hiatal Hernia, Congenital Diaphragmatic Hernia, Colonoscopy, and Gastrectomy. Dr. Guan is currently accepting new patients.

Walid Arnaout is a General Surgeon in Thousand Oaks, California. Dr. Arnaout is rated as an Experienced provider by MediFind in the treatment of Congenital Diaphragmatic Hernia. His top areas of expertise are Delirium, Gallbladder Disease, Hernia, Colostomy, and Hernia Surgery. Dr. Arnaout is currently accepting new patients.

Dr. Eisner attended medical school at New York University after receiving his undergraduate degree in Integrative Biology at U.C. Berkeley. He completed his General Surgery residency at U.C. San Diego. Dr. Eisner is a board eligible general surgeon with extensive experience in general surgical procedures including gastrointestinal (esophageal, stomach, small intestine, colon, rectal and anus), esophageal reflux, hernia (inguinal, umbilical, and ventral), skin and soft tissue (skin cancer and melanoma, lipoma, pilonidal), breast (benign and cancer) with advanced laparoscopic, minimally invasive, endoscopic, and robotic surgery skills.  As the newest member of our surgical team and a Southern California native, Dr. Eisner spends his off time surfing, rock climbing, and hiking. He is conversant in Spanish and fluent in French. Dr. Eisner is rated as an Experienced provider by MediFind in the treatment of Congenital Diaphragmatic Hernia. His top areas of expertise are Gallstones, Hernia, Gallbladder Disease, Bladder Reconstruction, and Gallbladder Removal.

Laya Nasrollah is a Gastroenterologist in Ventura, California. Dr. Nasrollah is rated as an Advanced provider by MediFind in the treatment of Congenital Diaphragmatic Hernia. Her top areas of expertise are Gastroesophageal Reflux Disease (GERD), Familial Adenomatous Polyposis, Diarrhea, Endoscopy, and Gastrectomy. Dr. Nasrollah is currently accepting new patients.

Donald Miller is a Gastroenterologist in Oxnard, California. Dr. Miller is rated as an Experienced provider by MediFind in the treatment of Congenital Diaphragmatic Hernia. His top areas of expertise are Gas Bloat Syndrome, Non-Alcoholic Fatty Liver Disease, Visceromegaly, Endoscopy, and Gastrectomy.

Justin Marasigan is a Gastroenterologist in Oxnard, California. Dr. Marasigan is rated as an Experienced provider by MediFind in the treatment of Congenital Diaphragmatic Hernia. His top areas of expertise are Familial Adenomatous Polyposis, Turcot Syndrome, Gardner Syndrome, Gastrectomy, and Colonoscopy. Dr. Marasigan is currently accepting new patients.

John Billesdon is a Gastroenterologist in Oxnard, California. Dr. Billesdon is rated as an Experienced provider by MediFind in the treatment of Congenital Diaphragmatic Hernia. His top areas of expertise are Gastrointestinal Bleeding, Colitis, Viral Gastroenteritis, Endoscopy, and Gastrectomy.

Samantha Wu is a General Surgeon in Oxnard, California. Dr. Wu has been practicing medicine for over 10 years and is rated as an Experienced provider by MediFind in the treatment of Congenital Diaphragmatic Hernia. Her top areas of expertise are Gallstones, Choledocholithiasis, Gallbladder Disease, and Retroperitoneal Inflammation. Dr. Wu is currently accepting new patients.

Makrouhi Kademian is a General Surgeon in Thousand Oaks, California. Dr. Kademian is rated as an Experienced provider by MediFind in the treatment of Congenital Diaphragmatic Hernia. Her top areas of expertise are Hernia, Hiatal Hernia, Gallbladder Disease, Hernia Surgery, and Bladder Reconstruction.

Gregory Johnson is a Gastroenterologist in Thousand Oaks, California. Dr. Johnson is rated as an Experienced provider by MediFind in the treatment of Congenital Diaphragmatic Hernia. His top areas of expertise are Gastrointestinal Bleeding, Diarrhea, Trichohepatoenteric Syndrome, Gastrectomy, and Endoscopy.

Shahram Daneshgar is a Gastroenterologist in Thousand Oaks, California. Dr. Daneshgar is rated as an Experienced provider by MediFind in the treatment of Congenital Diaphragmatic Hernia. His top areas of expertise are Gastric Dysmotility, Gastroesophageal Reflux Disease (GERD), Esophagitis, Endoscopy, and Gastrectomy.

Alister George is a Gastroenterologist in Thousand Oaks, California. Dr. George is rated as an Experienced provider by MediFind in the treatment of Congenital Diaphragmatic Hernia. His top areas of expertise are Esophagitis, Gastroesophageal Reflux Disease (GERD), Gastric Dysmotility, Endoscopy, and Colonoscopy.

Cristina Wiese is a Gastroenterologist in Thousand Oaks, California. Dr. Wiese is rated as an Experienced provider by MediFind in the treatment of Congenital Diaphragmatic Hernia. Her top areas of expertise are Gastric Dysmotility, Familial Adenomatous Polyposis, Gastroesophageal Reflux Disease (GERD), Gastrectomy, and Endoscopy.