Harold S. Nelson, MD

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.
Department of Medicine
Research AreasResearch Areas
  • Allergen Immunotherapy


University of Michigan, MS
Emory University, MD
Harvard College, BA
Letterman Army Medical Center, San Francisco, Internal Medicine
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-Present: 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
2018-2022: Harold S. Nelson MD lecture at annual meeting 

World Allergy Organization:
2007: Outstanding Clinician Award

Board Certification

Internal Medicine, Allergy/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. How our treatment of asthma has changed in the last half century. Ann Allergy Asthma Immunol. 2021 May 19:S1081-1206.
Nelson HS. 2020 Updated Asthma Guidelines: Allergen immunotherapy. J Allergy Clin Immunol. 2020 Dec;146(6):1286-1287.
Nelson HS. The evolution of allergy immunotherapy. Ann Allergy Asthma Immunol. 2021 Apr;126(4):357-366. 
Calderon MA, Waserman S, Bernstein DI, Demoly P, Douglass J, Gagnon R, Katelaris CH, Kim H, Nelson HS, Okamoto Y, Okubo K, Virchow JC, DuBuske L, Casale TB, Canonica GW, Nolte H.  Clinical Practice of Allergen Immunotherapy for Allergic Rhinoconjunctivitis and Asthma: An Expert Panel Report. J Allergy Clin Immunol Pract. 2020 Oct;8(9):2920-2936.
Nolte H, Bernstein DI, Nelson HS, Ellis AK, Kleine-Tebbe J, Lu S.  Efficacy and Safety of Ragweed SLIT-Tablet in Children with Allergic Rhinoconjunctivitis in a Randomized, Placebo-Controlled Trial.
J Allergy Clin Immunol Pract. 2020 Jul-Aug;8(7):2322-2331.

Academic Affiliations

Professor of Medicine

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.

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Contact Information

  • Office: 877.225.5654



  • National Jewish Health Main Campus
    1400 Jackson St.
    Denver, CO 80206

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