Walter M. Klein, MD

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Practice Philosophy

The pathologists at Main Line Health Laboratories are a diversified team of board-certified and fellowship-trained physicians who collaborate and consult with other Main Line Health physicians and surgeons, playing a crucial role in providing care to their patients. 

Pathology is the medical discipline that provides diagnostic information to patients and clinicians. It impacts nearly all aspects of patient care, from diagnosing cancer to managing chronic diseases through accurate laboratory testing.
Pathologists use gross, microscopic, immunologic, genetic and molecular methods to determine the presence of disease, and frequently work closely with surgeons, oncologists, OB/GYNs, dermatologists and other specialists. They can sub-specialize in different areas, such as gastroenterology, gynecologic pathology, blood diseases, clotting disorders, microbiology, lung and breast cancers, and more. For every sub-specialty in medicine or surgery, there is a pathologist counterpart, helping to make the correct diagnosis and guide the care of the patient.

Practice Name
Main Line Health Laboratories
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Locations and Appointments

Bryn Mawr Hospital
130 South Bryn Mawr Avenue
Bryn Mawr, PA 19010

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 Walter M. Klein, MD

Dr. Walter Klein is a surgical pathologist with subspecialization in dermatopathology.

He graduated summa cum laude from the University of Pittsburgh with a bachelors of science in chemistry. He spent his junior year abroad at the University of Sussex in Brighton England. He received his medical degree from the University of Pennsylvania. Dr. Klein completed a residency in anatomic and clinical pathology at The Johns Hopkins Hospital. Following residency he completed a dermatopathology fellowship in the combined Harvard program.

Dr. Klein is board-certified in anatomic and clinical pathology and dermatopathology. He is also a physician and patient advocate and very active with the Pennsylvania Medical Society, Pennsylvania Association of Pathologists, and the College of American Pathologists.

Specialties: Dermatopathology, Oncologic pathology

  • Gender: Male
  • Language: English, Spanish
Specialties Accepting New Patients
Laboratory Services and Pathology Board certified since 2005
Anatomic Pathology Board certified since 2005
Primary Affiliation
Clinical Titles
  • System Chief, Anatomic Pathology - Main Line Health
  • Site Chief & Medical Director, Laboratory - Bryn Mawr Hospital


Medical school
  • University of Pennsylvania Medical Center
  • Johns Hopkins Hospital
  • Harvard Medical School

*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

Current Membership & Activities
  • Board Certifications: Anatomic and Clinical Pathology, Dermatopathology

Patient Satisfaction Ratings and Comments