Petur Nielsen, MD is Associate Pathologist in the Department of Pathology and Director of Bone and Soft Tissue Pathology at Massachusetts General Hospital; Subspecialty Head, Bone and Soft Tissue Pathology; and Associate Professor of Pathology at Harvard Medical School in Boston. He is a co-author of Diagnostic Pathology: Bone, 2nd Edition.

Dr. Nielson received his MD from the University of Iceland and performed his residency at Massachusetts General Hospital. He is board certified in pathology and anatomic pathology.

Dr. Nielsen has written extensively on neoplastic and non-neoplastic diseases and of bone and soft tissue. He is the co-author of several book chapters and has participated in writing a number of sections for the World Health Organization (WHO) Classification of Tumors of Soft Tissue and Bone. Dr. Nielsen is a regular speaker at national and international pathology and orthopedic courses.