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Harold S. Nelson

Harold S. Nelson, MD, is an allergist and immunologist at National Jewish Health. Dr. Nelson is in the Division of Allergy and Clinical Immunology.



Harvard College, BA
Emory University, MD
University of Michigan, MS


1959 - 1962
Letterman Army Medical Center, San Francisco, Internal Medicine


1967 - 1969
University of Michigan, Allergy/Immunology

Awards & Recognition

American College of Allergy and Immunology:
2008, 2009: Harold S. Nelson Lectureship at annual meeting
2001: 1st Annual Gold-Headed Cane Award – for lifetime achievement
1995: Lester Mittelstaedt Lecturer
1990: McGovern Lecturer
1989: Jaros Lecturer
1986: Fellow, Distinguished Award
1985: Bela Schick Lecturer

American Academy of Allergy, Asthma and Immunology:
2008: Special Recognition Award
2005: Distinguished Service Award
2001-2017, 2020-2024: Harold S. Nelson Lectureship at annual meeting

National Jewish Health:
2006: Life-time Achievement Award
2005: Teacher of the Year Award

Western Society of Allergy, Asthma and Immunology
2018-2028 and continuing: Harold S. Nelson MD lecture at annual meeting 

World Allergy Organization:
2007: Outstanding Clinician Award

Board Certification

American Board of Internal Medicine
American Board of Allergy and Immunology

Professional Memberships

American Academy of Allergy, Asthma & Immunology (AAAAI)
American College of Allergy, Asthma & Immunology (ACAAI)
Colorado Allergy and Asthma Society
Royal College of Physicians (London)
Western Society of Allergy, Asthma and Immunology


Nelson HS, Bernstein DI, Biedermann T, Nolte H.  Sublingual immunotherapy tablets in monosensitized and polysensitized adults with allergic rhinoconjunctivitis. Allergy Asthma Proc. 2024 Jan 1;45(1):33-36.

Nelson HS. The Art of Immunotherapy. J Allergy Clin Immunol Pract. 2024 Jan;12(1):1-10.

Nelson HS, Sowers T, Plunkett G, Nolte H, Rance K. The Art of Dosing for Subcutaneous Immunotherapy in North America. J Allergy Clin Immunol Pract. 2024 Jan;12(1):13-22.

Nelson HS. Allergy immunotherapy for allergic fungal respiratory diseases. Allergy Asthma Proc. 2023 Nov 1;44(6):395-401.

Calderon MA, Casale TB, Nelson HS, Bacharier LB, Bansal P, Bernstein DI, Blaiss M, Corren J, DuBuske L, Fatteh S, Gagnon R, Greiwe J, Hoover H, Kolinsky NC, Namazy JA, Phipatanakul W, Plunkett G, Shaker M, Waserman S, Winders T, Rance K, Nolte H. Extrapolating Evidence-Based Medicine of AIT Into Clinical Practice in the United States. J Allergy Clin Immunol Pract. 2023 Apr;11(4):1100-1115.

Academic Affiliations

Professor of Medicine Emeritus

Teaching & Professional Positions

Professor of Medicine, National Jewish Health

Conflicts of Interest

National Jewish Health physicians and scientists may collaborate with pharmaceutical or other industries to develop medical and scientific breakthroughs or to provide education on trends in quality medical practice and outcomes to physicians and health professionals around the country. National Jewish Health maintains a strict conflict of interest policy to ensure that all potential conflicts are clearly visible and that management plans are put in place in order to further innovation and education while ensuring the protection of our patients and the integrity of our research. National Jewish Health publicly discloses any payment to our physicians or scientists. View this faculty member’s industry relationships and collaborations.