Timothy Michael Niessen, M.D., M.P.H.

Headshot of Timothy Michael Niessen
  • Assistant Professor of Medicine


Internal Medicine, Medical Education

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Main Phone

Outside of Maryland & Washington D.C.

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The Johns Hopkins Hospital

Appointment Phone: 410-502-2128
600 N. Wolfe Street
Nelson/Harvey Building, Suite 215
Baltimore, MD 21287 map
Phone: 410-955-3707


Dr. Timothy M. Niessen is an assistant professor of medicine at the Johns Hopkins University School of Medicine. His areas of clinical expertise are internal medicine and medical education.

Dr. Niessen earned his M.D. and completed his residency at Johns Hopkins. He holds an M.P.H. from the Johns Hopkins Bloomberg School of Public Health.

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  • Assistant Professor of Medicine

Departments / Divisions



  • MD; Johns Hopkins University School of Medicine (2009)


  • Medicine; Johns Hopkins University School of Medicine (2012)

Board Certifications

  • American Board of Internal Medicine (Internal Medicine) (2012)

Research & Publications

Selected Publications

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Kamdar BB, Niessen T, Colantuoni E, King LM, Neufeld KJ, Bienvenu OJ, Rowden AM, Collop NA, Needham DM. “Delirium transitions in the medical ICU: exploring the role of sleep quality and other factors.” Crit Care Med. 2015 Jan;43(1):135-41. doi: 10.1097/CCM.0000000000000610.

Block L, Habicht R, Wu AW, Desai SV, Wang K, Silva KN, Niessen T, Oliver N, Feldman L. “A post-2011 time motion study--the authors' reply.” J Gen Intern Med. 2014 Jan;29(1):24. doi: 10.1007/s11606-013-2669-9. No abstract available.

Block L, Habicht R, Oluyadi FO, Wu AW, Desai SV, Niessen T, Silva KN, Oliver N, Feldman L. “Variability in hand hygiene practices among internal medicine interns.” Am J Infect Control. 2013 Nov;41(11):1107-8. doi: 10.1016/j.ajic.2013.03.303.

Block L, Hutzler L, Habicht R, Wu AW, Desai SV, Novello Silva K, Niessen T, Oliver N, Feldman L. “Do internal medicine interns practice etiquette-based communication? A critical look at the inpatient encounter.” J Hosp Med. 2013 Nov;8(11):631-4. doi: 10.1002/jhm.2092. Epub 2013 Oct 12.

Block L, Habicht R, Wu AW, Desai SV, Wang K, Silva KN, Niessen T, Oliver N, Feldman L. “In the wake of the 2003 and 2011 duty hours regulations, how do internal medicine interns spend their time?” J Gen Intern Med. 2013 Aug;28(8):1042-7. doi: 10.1007/s11606-013-2376-6.

Probasco JC, Felling RJ, Carson JT, Dorsey ER, Niessen TM. “Teaching NeuroImages: myelopathy due to B₁₂ deficiency in long-term colchicine treatment and nitrous oxide misuse.” Neurology. 2011 Aug 30;77(9):e51. doi: 10.1212/WNL.0b013e31822c910f. No abstract available.

Shchepin R, Hornby JM, Burger E, Niessen T, Dussault P, Nickerson KW. “Quorum sensing in Candida albicans: probing farnesol's mode of action with 40 natural and synthetic farnesol analogs.” Chem Biol. 2003 Aug;10(8):743-50.

Patient Ratings & Comments

The Patient Rating score is an average of all responses to physician related questions on the national CG-CAHPS Medical Practice patient experience survey through Press Ganey. Responses are measured on a scale of 1 to 5, with 5 being the best score. Comments are also gathered from our CG-CAHPS Medical Practice Survey through Press Ganey and displayed in their entirety. Patients are de-identified for confidentiality and patient privacy.

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