Ryan Roemmich
Phone: 443-923-2717
Kennedy Krieger Institute

707 N. Broadway
Room G-04B
Baltimore, MD 21205
United States

Research Departments


Dr. Ryan Roemmich is a research scientist at the Kennedy Krieger Institute and an assistant professor of Physical Medicine and Rehabilitation at The Johns Hopkins University School of Medicine. Dr. Roemmich’s research lab (located in the Motion Analysis Lab) focuses on understanding mechanisms of locomotor control and rehabilitation in persons affected by neurological damage or disease.


Dr. Roemmich earned a bachelor of science degree in biological systems engineering from the University of Nebraska-Lincoln in 2009. He then completed his doctoral degree in biobehavioral science at the University of Florida in 2013 and a post-doctoral fellowship in neuroscience at the Kennedy Krieger Institute and Johns Hopkins University School of Medicine in 2017. He has been a research scientist at the Kennedy Krieger Institute and an assistant professor of physical medicine and rehabilitation at the Johns Hopkins University School of Medicine since 2017.


Dr. Roemmich is a human movement scientist interested in walking and rehabilitation of persons with neurologic damage or disease. His research focuses on combining neuroscience, clinical gait analysis, and engineering to understand how the nervous system controls locomotion and how we can improve walking in persons with gait dysfunction. Dr. Roemmich’s lab uses three-dimensional motion capture, electromyography, interactive feedback, metabolic testing, and clinical examination to solve these problems. My long-term research goals aim to 1) understand the mechanisms that underlie human locomotion, and 2) develop innovative, effective walking treatments for persons with neurologic damage or disease.

Related Links

Google Scholar Profile

Research Publications

Roper JA, Brinkerhoff SA, Harrison BR, Schmitt AC, Roemmich RT, Hass CJ (2019). Persons with essential tremor can adapt to new walking patterns. J Neurophysiol (in press).

Roemmich RT, Leech KA, Gonzalez AJ, Bastian AJ (2019). Trading symmetry for energy cost during walking in healthy adults and persons poststroke. Neurorehabil Neural Repair (in press).

Roemmich RT, Roper JA, Eisinger RS, Cagle JN, Maine L, Deeb W, Wagle Shukla A, Hess CW, Gunduz A, Foote KD, Okun MS, Hass CJ (2019). Gait worsening and the microlesion effect following deep brain stimulation for essential tremor. J Neurol Neurosurg Psychiatry. 90(8), 913-919.

Leech KA, Day KA, Roemmich RT, Bastian AJ (2018). Movement and perception recalibrate differently across multiple days of locomotor learning. J Neurophysiol. 120(4), 2130-2137.

Leech KA, Roemmich RT (2018). Independent voluntary correction and savings in locomotor learning. J Exp Biol. 221(15), pii: jeb181826.

Roemmich RT, Bastian AJ (2018). Closing the loop: from motor neuroscience to neurorehabilitation. Annu Rev Neurosci. 41, 415-429.

Day KA, Leech KA, Roemmich RT, Bastian AJ (2018). Accelerating locomotor savings in learning: compressing four training days to one. J Neurophysiol. , .

Leech KA, Roemmich RT, Bastian AJ (2018). Creating flexible motor memories in human walking. Sci Rep. 8(1), 94. 

Roper JA, Roemmich RT, Tillman MD, Terza MJ, Hass CJ (2017). Split-Belt Treadmill Walking Alters Lower Extremity Frontal Plane Mechanics. J Appl Biomech. 33(4), 256-260. 

Roemmich RT, Long AW, Bastian AJ (2016). Seeing the Errors You Feel Enhances Locomotor Performance but Not Learning. Curr Biol. 26(20), 2707-2716. 

Musselman KE, Roemmich RT, Garrett B, Bastian AJ (2016). Motor learning in childhood reveals distinct mechanisms for memory retention and re-learning. Learn Mem. 23(5), 229-37. 

Long AW, Roemmich RT, Bastian AJ (2016). Blocking trial-by-trial error correction does not interfere with motor learning in human walking. J Neurophysiol. 115(5), 2341-8.

Park K, Roemmich RT, Elrod JM, Hass CJ, Hsiao-Wecksler ET (2016). Effects of aging and Parkinson's disease on joint coupling, symmetry, complexity and variability of lower limb movements during gait. Clin Biomech (Bristol, Avon). 33, 92-97. 

Skinner JW, Lee HK, Roemmich RT, Amano S, Hass CJ (2015). Execution of Activities of Daily Living in Persons with Parkinson Disease. Med Sci Sports Exerc. 47(9), 1906-12. 

Roemmich RT, Bastian AJ (2015). Two ways to save a newly learned motor pattern. J Neurophysiol. 113(10), 3519-30.

Roemmich RT, Fregly BJ, Hass CJ (2014). Neuromuscular complexity during gait is not responsive to medication in persons with Parkinson's disease. Ann Biomed Eng. 42(9), 1901-12. 

Roemmich RT, Hack N, Akbar U, Hass CJ (2014). Effects of dopaminergic therapy on locomotor adaptation and adaptive learning in persons with Parkinson's disease. Behav Brain Res. 268, 31-9.

Huynh KV, Sarmento CH, Roemmich RT, Stegemöller EL, Hass CJ (2014). Comparing aftereffects after split-belt treadmill walking and unilateral stepping. Med Sci Sports Exerc. 46(7), 1392-9.

Roemmich RT, Nocera JR, Stegemöller EL, Hassan A, Okun MS, Hass CJ (2014). Locomotor adaptation and locomotor adaptive learning in Parkinson's disease and normal aging.Clin Neurophysiol. 125(2), 313-9.

Roemmich RT, Zeilman PR, Vaillancourt DE, Okun MS, Hass CJ (2013). Gait variability magnitude but not structure is altered in essential tremor. J Biomech. 46(15), 2682-7. 

Fernandez KM, Roemmich RT, Stegemöller EL, Amano S, Thompson A, Okun MS, Hass CJ(2013). Gait initiation impairments in both Essential Tremor and Parkinson's disease.Gait Posture. 38(4), 956-61.

Rodriguez KL, Roemmich RT, Cam B, Fregly BJ, Hass CJ (2013). Persons with Parkinson's disease exhibit decreased neuromuscular complexity during gait. Clin Neurophysiol. 124(7), 1390-7.

Amano S, Roemmich RT, Skinner JW, Hass CJ (2013). Ambulation and Parkinson disease.Phys Med Rehabil Clin N Am. 24(2), 371-92.

Nocera JR, Roemmich R, Elrod J, Altmann LJ, Hass CJ (2013). Effects of cognitive task on gait initiation in Parkinson disease: evidence of motor prioritization? J Rehabil Res Dev. 50(5), 699-708.

Roemmich RT, Field AM, Elrod JM, Stegemöller EL, Okun MS, Hass CJ (2013). Interlimb coordination is impaired during walking in persons with Parkinson's disease. Clin Biomech (Bristol, Avon). 28(1), 93-7. 

Roemmich RT, Stegemöller EL, Hass CJ (2012). Lower extremity sagittal joint moment production during split-belt treadmill walking. J Biomech. 45(16), 2817-21.

Roemmich RT, Nocera JR, Vallabhajosula S, Amano S, Naugle KM, Stegemöller EL, Hass CJ(2012). Spatiotemporal variability during gait initiation in Parkinson's disease. Gait Posture. 36(3), 340-3.

Stegemöller EL, Buckley TA, Pitsikoulis C, Barthelemy E, Roemmich R, Hass CJ (2012). Postural instability and gait impairment during obstacle crossing in Parkinson's disease.Arch Phys Med Rehabil. 93(4), 703-9. 

Day KA, Roemmich RT, Taylor JA, Bastian AJ (2000). Visuomotor Learning Generalizes Around the Intended Movement. ENeuro. 3(2),