Physicians
As fully trained and Board Certified allergists, our physicians are highly trained to determine the cause of allergies related to foods, the environment, drugs, or topical substances.
Our medical staff includes the following professionals:
Our medical staff includes the following professionals:
Juan C. Mas, M.D.
Physician
Dr. Mas grew up in St. Augustine and comes from a medical family. His father and several siblings are physicians. He is Board Certified by the American Board of Allergy and Immunology. Dr. Mas did his residency and fellowship at the Columbia Presbyterian Hospital in New York City. He is expert in the care of allergies and asthma.
Physician
Dr. Mas grew up in St. Augustine and comes from a medical family. His father and several siblings are physicians. He is Board Certified by the American Board of Allergy and Immunology. Dr. Mas did his residency and fellowship at the Columbia Presbyterian Hospital in New York City. He is expert in the care of allergies and asthma.
Bernard Zeffren, MD
Physician
Bernard Zeffren, MD has been providing high-quality allergy and immunology care to the Central Florida community for over 25 years!
After graduating with honors from Washington University in St. Louis, he earned his Doctor of Medicine Degree from the University of Texas Health Science Center at San Antonio as a member of the AΩA Medical Academic Honor Society. He performed his Pediatric Residency at Cardinal Glennon Children's Hospital/St. Louis University, and completed a fellowship in Adult and Pediatric Allergy and Immunology at All Children's Hospital/University of South Florida.
Dr. Zeffren is board-certified by the American Board of Allergy & Immunology and is an active member of several leading medical organizations, including the American Academy of Allergy, Asthma & Immunology (AAAAI), the Florida Allergy, Asthma & Immunology Society (FAAIS), and the Physicians Society of Central Florida. He presently serves as a Committee Chair for the FAAIS, having previously served as President for one year and on the Executive Board for seven years.
Dr. Zeffren has been married for 29 years and raised three wonderful children. He enjoys playing tennis and golf in his spare time and is an avid hockey fan (Go Blues and Lightning!).
Physician
Bernard Zeffren, MD has been providing high-quality allergy and immunology care to the Central Florida community for over 25 years!
After graduating with honors from Washington University in St. Louis, he earned his Doctor of Medicine Degree from the University of Texas Health Science Center at San Antonio as a member of the AΩA Medical Academic Honor Society. He performed his Pediatric Residency at Cardinal Glennon Children's Hospital/St. Louis University, and completed a fellowship in Adult and Pediatric Allergy and Immunology at All Children's Hospital/University of South Florida.
Dr. Zeffren is board-certified by the American Board of Allergy & Immunology and is an active member of several leading medical organizations, including the American Academy of Allergy, Asthma & Immunology (AAAAI), the Florida Allergy, Asthma & Immunology Society (FAAIS), and the Physicians Society of Central Florida. He presently serves as a Committee Chair for the FAAIS, having previously served as President for one year and on the Executive Board for seven years.
Dr. Zeffren has been married for 29 years and raised three wonderful children. He enjoys playing tennis and golf in his spare time and is an avid hockey fan (Go Blues and Lightning!).
Shayna Zimmer PA-C
Allergy Physician Assistant
Shayna is a graduate of Spruce Creek High School in Port Orange. She attained her Bachelor of Arts degree from UCF and was Magna Cum Laude. She then worked in the medical field for 6 years as an EMG/NCV technician for Florida Medical Associates in Daytona Beach. Shayna then returned to school to get her Master of Science Degree, Physician Assistant Studies from Bethel College in Tennessee. Before joining Asthma & Allergy Specialists she worked as a PA for a Gastroenterology group in New Smyrna. Shayna is a member of both the American Academy of Physician Assistants (AAPA) and Florida Academy of Physician Assistants (FAPA).
Allergy Physician Assistant
Shayna is a graduate of Spruce Creek High School in Port Orange. She attained her Bachelor of Arts degree from UCF and was Magna Cum Laude. She then worked in the medical field for 6 years as an EMG/NCV technician for Florida Medical Associates in Daytona Beach. Shayna then returned to school to get her Master of Science Degree, Physician Assistant Studies from Bethel College in Tennessee. Before joining Asthma & Allergy Specialists she worked as a PA for a Gastroenterology group in New Smyrna. Shayna is a member of both the American Academy of Physician Assistants (AAPA) and Florida Academy of Physician Assistants (FAPA).
Sherry Housley, APRN
Advanced Practice Registered Nurse, Certified Nurse Practitioner
Originally from Arkansas, Sherry Housley, APRN, is an Advanced Practice Registered Nurse, who began her career at Oklahoma City University where she received her Bachelor of Science in Health Administration and Technical Supervision. After Oklahoma City University, she received her Associate of Arts in Nursing/Registered Nurse from National Park Community College and ended her schooling at Walden University where she received her Master of Nursing.
Sherry comes to us with over 20 years of clinical experience in Family Medicine, ENT, Immunology, Pediatrics, and Otolaryngology. She is passionate about providing quality patient care and committed to working alongside her patients to help them find relief from allergy and asthma symptoms! Sherry is an Advanced Practice Registered Nurse and Certified Nurse Practitioner.
Advanced Practice Registered Nurse, Certified Nurse Practitioner
Originally from Arkansas, Sherry Housley, APRN, is an Advanced Practice Registered Nurse, who began her career at Oklahoma City University where she received her Bachelor of Science in Health Administration and Technical Supervision. After Oklahoma City University, she received her Associate of Arts in Nursing/Registered Nurse from National Park Community College and ended her schooling at Walden University where she received her Master of Nursing.
Sherry comes to us with over 20 years of clinical experience in Family Medicine, ENT, Immunology, Pediatrics, and Otolaryngology. She is passionate about providing quality patient care and committed to working alongside her patients to help them find relief from allergy and asthma symptoms! Sherry is an Advanced Practice Registered Nurse and Certified Nurse Practitioner.
