Our Staff

Allergy & Asthma Doctors Who are Dedicated to You

You can get treatment for allergies and asthma from a group of physicians, nurses, technologists, and ancillary staff who enjoy helping patients find relief—right here in Lancaster County, PA. Our allergy & asthma doctors can treat the cause of your symptoms, so those symptoms no longer interfere with your lifestyle and well-being.

our staff

Meet our Asthma & Allergy Doctors

Stephen D. Lockey, III, MD

Stephen D. Lockey, III, MD


  • Native of Lancaster, Pennsylvania.
  • B.A. – Franklin and Marshall College
  • M.D.– Temple University
  • Internship – Lancaster General Hospital, Lancaster, Pennsylvania
  • Residency – Internal Medicine, University Hospital, University of Wisconsin Medical School.
  • Post Doctoral Fellowship in Allergy and Immunology University of Wisconsin Medical School
  • Board Certified – Internal Medicine Allergy and Immunology
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Dr. Lockey was born and raised in Lancaster County. His parents encouraged him at an early age to become a physician. He has two brothers who are also physicians and a sister who serves as an executive in the healthcare field.

Dr. Lockey sees working at the Allergy & Asthma Center as an opportunity to interact with the community, diagnosing patients in a state-of-the-art facility. He enjoys designing a cost-effective treatment plan for patients that fits their circumstances and lifestyle in a friendly atmosphere of trust.

His passion for the field of allergy medicine has led him to participate in several related organizations, including:

  • Pennsylvania Allergy and Asthma Association
  • Pennsylvania Medical Society
  • Lancaster County Medical Society
  • American Academy of Allergy, Asthma and Immunology
  • American College of Allergy, Asthma and Immunology
  • Lancaster County Asthma Allergy Foundation

Dr. Lockey serves as Chief of Allergy at Lancaster General Hospital and is on courtesy staff at Lancaster Regional Medical Center.

In addition to his medical duties, Dr. Lockey has also presented and published papers in the field of allergy and immunology.

Dr. Lockey served as a major in the U.S. Air Force Medical Corps at Air Force Base in Washington. D.C.

He currently serves on the boards of Lancaster Farmland Trust and the Lancaster County Salvation Army.

Dr. Lockey is married and has five daughters and one son. He is an avid amateur botanist with a particular interest in wildflowers. He also enjoys studying history and playing golf in his spare time.

“Congratulations on 50 years of medical staff membership. Your many years of service as division chief and service to the community are commendable. It is obvious that you care about your patients and community and that being a physician to you is not simply a career but is a way of life.”

William H. Adams, M.D., LGH
Mark J. Titi

Mark J. Titi, MD


  • Native of Washington, D.C.
  • B.S. – Chemistry, University of Maryland
  • M.D. – University of Maryland Campus for the Professions
  • Research In – Radioimmunoassay, Johns Hopkins University of Medicine, Division of Nephrology
  • Internship/Residency – General Internal Medicine, York Hospital, York, Pennsylvania
  • Post Doctoral Fellowship – Allergy and Clinical Immunology, Johns Hopkins Asthma and Allergy Center
  • Board Certified – Internal Medicine, Allergy and Immunology
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Dr. Titi’s own childhood battle with allergies motivated him to become a doctor at an early age. During his residency program, he finally found treatment for his own allergies that turned his life around, allowing him to breathe more comfortably, have more energy, and participate in outdoor activities he had missed out on earlier in life. Following a successful rotation at Johns Hopkins, Dr. Titi embraced allergy treatment as his specialty.

Dr. Titi joined Allergy Asthma Center in 1993. He loves treating patients of all ages, doing detective work to effectively diagnose chronic conditions while formulating a custom treatment plan for each individual. He especially enjoys complex cases and the satisfaction of improving patients’ lives.

Dr. Titi has received numerous academic honors and has given many lectures about allergies and asthma. His research interests include sinus problems, asthma, food allergies, and chronic coughs.

He is a member of the Pennsylvania Medical Society; American Academy of Allergy, Asthma and Immunology; The American College of Allergy, Asthma and Immunology; and the Pennsylvania Allergy and Asthma Association. Dr. Titi is chief of Allergy and Immunology at Lancaster Regional Medical Center.

Dr. Titi is married and has a daughter and a son. He enjoys music and painting and has special interests in hiking, skiing, golfing, and reading.

Robin Rochow

Robin Rochow, MPAS, PA-C


Robin Rochow is a Pennsylvania native who graduated from Manheim Township High School. She went to Bloomsburg University and earned her Bachelor of Science degree in Medical Technology. She worked in hospital labs prior to deciding to continue her education at DeSales University, where she earned her master’s degree in Physician Assistant Studies. She has worked in several medical specialties, such as orthopedic surgery, family medicine, correctional medicine, and addiction medicine.

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She is an active member of the Pennsylvania Physician Assistant Society.

When Robin is not in the office, she enjoys being outdoors. Her son is an Eagle Scout, and she has been an advisor for area BSA Venture Crews. She and her son completed a 100-mile canoe trip with Troup 38 in Allagash, ME, and a 50-mile canoe trip in the Adirondacks with Crew 82.

Happy young Hispanic mother and girl meditating on couch, sitting in lotus pose with zen hands, fingers, smiling with closed eye

Find Relief with the Help of Our Allergy & Asthma Doctors

As you can see, the doctors and Allergy & Asthma Center in Lancaster, PA are dedicated to solving the puzzle of your allergic symptoms.

What is causing your symptoms? Is your asthma the result of allergies? Is immunotherapy right for you?

These are just a few questions you’ll find answers to when you allow our allergy and asthma doctors to care for you. Let’s talk about how to get started today!

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What Our Patients Have To Say

Allergy & Asthma Center Lancaster

2445 Marietta Ave., Lancaster, PA 17601
Phone: 717-393-1365
Fax: 717-393-8540

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Hours: (office will be closed Friday)
Monday & Tuesday: 7am – 5pm
Wednesday: 8am – 5pm
Thursday: 8am – 6pm

*Please note that all times are subject to change
(Lancaster office phones are on from 8am – 5pm)

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