Chad Ryan Marion, DO, PhD
- Assistant Professor, Pulmonary, Critical Care, Allergy, and Immunologic Diseases

Chad Ryan Marion, DO, PhD
Research Interests
- Pneumonia, Bacterial
- Legionella
- Pneumonia, Mycoplasma
- Community-Acquired Infections
- Pseudomonas Aeruginosa
- Cystic Fibrosis
- Education
- DO, Lake Erie College of Osteopathic Medicine, 2008
- Residency
- Internal Medicine, Cleveland Clinic Foundation, 2011
- Fellowship
- Critical Care, Yale - New Haven Hospital, 2015
- Board Certifications
- American Board of Internal Medicine, Critical Care Medicine
- American Board of Internal Medicine, Internal Medicine
- American Board of Internal Medicine, Pulmonary Disease
- Memberships
- American Thoracic Society
- American Osteopathic Association
- American College of Chest Physicians
- Positions
- Assistant Professor, Pulmonary, Critical Care, Allergy, and Immunologic Diseases
- Departments and Affiliations
- Pulmonary, Critical Care, Allergy, and Immunologic Diseases
Research
- Toll-Like Receptors 2 and 4 Modulate Pulmonary Inflammation and Host Factors Mediated by Outer Membrane Vesicles Derived from Acinetobacter baumannii. Marion CR, Lee J, Sharma L, Park KS, Lee C, Liu W, Liu P, Feng J, Gho YS, Dela Cruz CS. Infect. Immun. 2019 09; 87(9)
- Regulation and Role of Chitotriosidase during Lung Infection with Klebsiella pneumoniae. Sharma L, Amick AK, Vasudevan S, Lee SW, Marion CR, Liu W, Brady V, Losier A, Bermejo SD, Britto CJ, Lee CG, Elias JA, Dela Cruz CS. J. Immunol. 2018 07; 201(2):615-626.
- Atypical Pneumonia: Updates on Legionella, Chlamydophila, and Mycoplasma Pneumonia. Sharma L, Losier A, Tolbert T, Dela Cruz CS, Marion CR. Clin. Chest Med. 2017 Mar; 38(1):45-58.
- ATS Core Curriculum 2016. Part IV. Adult Pulmonary Medicine Core Curriculum. Michaud GC, Channick CL, Law AC, McCannon JB, Antkowiak M, Garrison G, Sayah D, Huynh RH, Brady AK, Adamson R, DuBrock H, Akuthota P, Marion C, Dela Cruz C, Town JA, Çoruh B, Thomson CC. Ann Am Thorac Soc. 2016 07; 13(7):1160-9.
- Chitinase 3-Like 1 (Chil1) Regulates Survival and Macrophage-Mediated Interleukin-1ß and Tumor Necrosis Factor Alpha during Pseudomonas aeruginosa Pneumonia. Marion CR, Wang J, Sharma L, Losier A, Lui W, Andrews N, Elias JA, Kazmierczak BI, Roy CR, Dela Cruz CS. Infect. Immun. 2016 07; 84(7):2094-2104.
- A study to learn about the effects of the drug combination Elexacaftor/Tezacaftor/Ivacaftor in patients with Cystic Fibrosis
- Study Evaluating the Effectiveness and Safety of Combination Therapy in Individuals with Cystic Fibrosis
- Study evaluating the effectiveness of VX-121 combination therapy (study drug) in people with cystic fibrosis who are heterozygous for F508del and a minimal function mutation