About Us

We are a community-based obstetrics and gynecology practice addressing health care in Port Jefferson Station and the surrounding communities. Our goal at Argen Medical is for you to feel confident about the quality and coordination of the medical care you receive. Argen Medical currently delivers at St. Charles Hospital. 

Physicians & Staff

Dr. San RomanGustavo San Román, MD

Dr. San Román was born in La Plata, Argentina and immigrated to the United States at the age of two. He is the son of a civil engineer and a Spanish dance teacher. He is also the youngest of four boys who have all become physicians. The family immigrated to Queens, NY and later settled in Hempstead on Long Island. While growing up, he was taught the Spanish language at home and the English language in school and remains bilingual. 
Dr. San Román has always been active in sports including baseball, football, soccer, hockey and in college, at Adelphi University he became a certified SCUBA diver. In college, he discovered a passion for computer programming and became proficient in several computer languages. In medical school at the Pennsylvania State University College of Medicine in Hershey, Pennsylvania, he was one of the authors of a textbook on computer programming in a language called Mumps (Massachusetts General Hospital Utility Multi-Programming System). While in practice, he has developed software to improve workflow in the office setting.
After graduating from medical school, Dr. San Román started his residency training at the Long Island Jewish Hospital in New Hyde Park, NY and completed his training at Stony Brook University Hospital. After completing his residency training, Dr. San Román became board certified by the American Board of Obstetrics and Gynecology. He has maintained his board certification and is currently a fellow of the American College of Obstetricians and Gynecologists.
Dr. San Román has lived in and serviced the local community since 1990, including helping his wife to raise seven children. He works out of the three local hospitals and continues to strive for excellence in patient care and expects the same from the staff in his office. Dr. San Román welcomes new patients and is currently helping the women whose births he attended to start families of their own.

Dr. Dana BrennerDana Brenner, MD, FACOG

Dr. Brenner is board certified in obstetrics and gynecology by the American Board of Obstetrics and Gynecology and is a fellow of the American College of Obstetricians and Gynecologists. Dr. Brenner received her medical education at the SUNY Health Science Center at Syracuse College of Medicine, NY. She then completed her residency training at Nassau County Medical Center in East Meadow, NY in obstetrics and gynecology. Dr. Brenner has been serving the community since 1996.







Erin ChristianoErin Christiano Tobia, NP

Erin Christiano Tobia is a board-certified women’s health nurse practitioner. She received her master’s degree in nursing from SUNY Downstate Health Sciences University while working as a labor and delivery nurse. Erin has dedicated her career to ensuring women receive the most comprehensive and compassionate care. By combining her leadership experience with her clinical experience as a Nurse Practitioner, Erin worked with the team of Maternal-Fetal Medicine at Lenox Hill Hospital to update many patient treatment policies, including skin-to-skin promotion and hypertensive emergency guidelines. 

Erin believes the best care is provided when a patient feels heard and respected. She is committed to ensuring that all her patients feel empowered. She continues to stay up to date on current practice guidelines so that she can provide the best care to her patients and looks forward to bringing that knowledge to the communities that Argen Medical serves.

She holds numerous certifications in her specialty, including NCC Maternal Newborn Nursing certification, NCC Electronic Fetal Monitoring certification, and Baby Friendly Lactation certification.  Erin is a Daisy Nurse Leader Award Recipient, which she received as Assistant Nurse Manager of Lenox Hill Hospital’s esteemed Labor and Delivery unit.






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