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.

Meet our Asthma & Allergy Doctors
The medical professionals at Allergy & Asthma Center in Lancaster, PA are allergists, but we’re also trained in internal medicine. That means we can recognize the systemic effects of your asthma or allergic reactions and treat you holistically. We can complete large bloodwork panels in-house rather than sending them to an independent laboratory.

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

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

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!

What Our Patients Have To Say
Allergy & Asthma Center Lancaster
2445 Marietta Ave., Lancaster, PA 17601
Phone: 717-393-1365
Fax: 717-393-8540
Hours: (office will be closed most Fridays)
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)