Thomas E. Klein, MD

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To make an appointment, please call 610.789.1313
Practice Philosophy

We specialize in adult and pediatric allergy and asthma. We are dedicated to providing compassionate, high quality medical care to patients of all ages.

We emphasize open lines of communication in our practice. To improve the quality of medical care, we encourage questions and enjoy teaching our patients about allergies and asthma. We are thorough in providing written instructions and informational brochures to help our patients improve rapidly and to get the most out of their medical care. We will communicate with your primary care physician about our findings and recommendations.

Our goal is to help patients fully participate in daily activities at work, school or sports without allergy or asthma getting in the way. Asthma and allergies should not cause absenteeism or interfere with sleep.

Our staff works as a team. Our staff is chosen for their warmth, maturity, and concern for patients. We all take pride in providing a caring environment and building a strong doctor-patient relationship.

Practice Name
  • Thomas Klein, M.D., P.C.
View all providers within this practice

Locations and Appointments

400 West Township Line Road
Havertown, PA 19083
  • Phone: 610.789.1313
  • Fax: 610.789.0655
  • Accessibility: Public Transportation

Lankenau MOB East, Suite 551
100 East Lancaster Avenue
Wynnewood, PA 19096
  • Phone: 610.896.5600
  • Fax: 610.789.0655
  • Accessibility: Public Transportation

Do you have questions or are you looking for help in choosing the right provider?

Call 1.866.CALL.MLH (1.866.225.5654), Monday through Friday between 8:00 am–6:00 pm ET, to speak with a member of our referral staff who can help find the doctor who is right for you.

About Thomas E. Klein, MD

Dr. Thomas Klein was born in New York City in 1957. At the age of 16 he started college at Rensselaer Polytechnic Institute in Troy, New York where he graduated with honors. He earned his medical degree from Albany Medical College in 1980 at the age of 22 and then began five years of additional training.
Dr. Klein was an Intern, Resident and Chief Resident at Long Island Jewish Hillside Medical Center in New York City from 1980 to 1983. As a Chief Resident he supervised and taught over fifty physicians in three hospitals, managed the Intensive Care Unit, and was responsible for all hospitalized patients.
Dr. Klein completed his fellowship in Adult and Pediatric Allergy and Immunology at St. Christopher's Hospital in Philadelphia in 1985. During his training he performed clinical research, authored medical journal articles and presented scientific studies at medical conferences around the country.
In 1985 he opened his practice in Adult and Pediatric Allergy, Asthma and Immunology with offices in Havertown and Media, Pennsylvania. He opened his Lankenau Hospital office in 2006.
Dr. Klein continues to enjoy teaching as he frequently lectures at medical grand rounds and seminars throughout the country. He has worked as an expert medical consultant for law firms, an organic food company, pharmaceutical companies and a local school district. He has been interviewed on numerous occasions in New York and Philadelphia on television, radio and in newspapers. He has also authored chapters in several medical textbooks and has been recognized as a "Top Doc" many times. Dr. Klein is Board Certified in Allergy and Clinical Immunology.
  • Language: English, German, French
Specialties Accepting New Patients
Allergy, Asthma and Immunology Board certified since 1986
Pediatric Allergy & Immunology
Primary Affiliation
Clinical Titles
  • Allergist


Medical school
  • Albany Medical College
  • Long Island Jewish Medical Center
  • Long Island Jewish Medical Center
  • St. Christopher's Hospital of Philadelphia

*Members of the Main Line Health medical staff are affiliated with Bryn Mawr Hospital, Lankenau Medical Center, Paoli Hospital and Riddle Hospital. Membership on the medical staff of any of our hospitals does not constitute an employment or agency relationship.

Awards & Memberships

Honors, Awards, Citations
  • Philadelphia magazine Top Doctor
  • Main Line Today Top Doctor
Current Membership & Activities
  • American College of Allergy, Asthma and Immunology
  • Pennsylvania Allergy and Asthma Association
  • Pennsylvania Medical Society
  • Delaware County Medical Society
  • Pennsylvania Allergy and Asthma Association
  • Pennsylvania Medical Society
  • Delaware County Medical Society