Our Leaders


Michel Torbey, MD, MPH, FNCS, FCCM, FAHA, FANA

Director, Division of Cerebrovascular Diseases & Neurocritical Care

As medical director of the Neurovascular Stroke Center, I specialize in stroke, acute neurological emergencies, intracerebral hemorrhage, and TBI.


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Ciaran Powers, MD, PhD

Associate Professor, Department of Neurological Surgery

I often care for patients with potentially devastating and frightening diseases. I received my MD from Georgetown University, completed a Neurological Surgery residency at Duke University and fellowships in neurointerventional radiology at University of Wisconsin-Madison and Duke University.

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Diana Greene-Chandos, MD

Director, Neuroscience Critical Care Quality, Education and Outreach; Director, Neurocritical Care Fellowship

I work in the Neuroscience Critical Care Unit and on the stroke neurology floor. I received my MD from the University of Arizona, completed a neurology residency at Washington University and a neurocritical care fellowship at Johns Hopkins University.


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Our Doctors

Our Researchers


Yousef Hannawi, MD

Assistant Professor, Neurology

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Andrew Slivka, MD, FAHA

Professor, Neurology

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Diana Greene-Chandos, MD

Director, Neuroscience Critical Care Quality, Education and Outreach; Director, Neurocritical Care Fellowship

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Stephen Page, PhD, MOT, OTR/L

Associate Professor, Occupational Therapy

Advanced Practice Providers


Susan Yeager, MS, RN, CCRN

Clinical Instructor, Neurocritical Care Lead Nurse Practitioner

For nearly 10 years, I have worked in Neurosurgical Critical Care and Trauma as an acute care nurse practitioner before joining Neurocritical Care. I received my BSN from Capital University School of Nursing and my MS in Adult Cardiopulmonary from The OSU College of Nursing. I completed my MS degree in Acute Care Nursing Practice at Wright State University College of Nursing and Health. My clinical interests include cerebrovascular diseases, neurocritical care and traumatic brain injury.


Noah Grose, RN, CNP, ACNP

Division of Cerebrovascular Diseases & Neurocritical Care

I received my BSN at Alderson-Broaddus College in Philippi, West Virginia. Following graduation, I worked as an intensive care nurse at the University of Kentucky Medical Center and received my Master of Science degree in Nursing and Acute Care Nursing Practice. I have been a member of the Stroke and Neurocritical Care team since 2011. My clinical interests include acute management of hemorrhagic strokes, hydrocephalus, acute hypertensive management and neurocritical care.


Nicole Elking, MSN, RN, CNP

Neurocritical Care Unit

In 2013, I joined the Neurocritical Care Unit, where I manage the critically ill neuroscience patient population while providing individualized care. I completed my BSN at the University of Toledo and my Masters of Science in Nursing: Adult-Gerontology Acute Care Nurse Practitioner at Ohio State. I joined the OSU Wexner Medical Center in 2008 as a nursing intern in the medical and surgical ICU. Following my internship, I joined the Neuroscience/Trauma Progressive Care Unit.


Thomas Lawson, MSN, RN, ACNP-BC

Neurosciences Critical Care

In 2006, I joined the Ross Heart Hospital at Ohio State as an acute care nurse practitioner in Cardiothoracic Surgery and later worked in the Medical ICU. I currently serve in the Neurosciences Critical Care Unit. I also assist with clinical teaching and mentorship of junior nurse practitioners, residents and medical students. My clinical interests include the critical care management of all neurologic conditions and safe performance of procedures. 


Marissa DeJesus, MS, RN, FNP-BC

Certified Nurse Practitioner

I received both my BSN and MS in Community Health Nursing from Ohio State. I later completed my Family Nurse Practitioner certification in 2005 from Ohio State. I joined the Department of Neurological Surgery in 2008. My clinical interests include recovery and transitions in care of stroke and neurosurgical patients. I currently facilitate the Aneurysm and AVM support group. I am on the executive board of the Philippine Nurses Association of Central Ohio.


Mark Constable, MSN, RN, AGACNP-BC

Certified Nurse Practitioner

As a CNP, I focus on diagnosing and treating patients with neurologic diseases requiring neurological surgery. I provide leadership on a multidisciplinary team to help drive quality outcomes and continuity of care. I'm involved in every aspect of care including inpatient and outpatient, pre- and post-operative follow-up and consultation. I completed my BSN at the University of Akron and my MS in Nursing at Duke University.


Randy Yadav, CNP

Randy Yadav is a certified nurse practitioner for the Comprehensive Stroke Center.

Rayvn Cash

Ravyn Cash, CNP

Ravyn Cash is a certified nurse practitioner for the Comprehensive Stroke Center.

Our Staff

Our leaders


Karen Wiles, BSN, RN, CCM

TeleStroke Program Manager, Neurovascular Stroke Center


Sharon Heaton, MA, BSN, RN

Associate Director, Neurovascular Comprehensive Stroke Center


Cassie Forrest, BSN, RN

Nursing Program Manager, Neurovascular Comprehensive Stroke Program


Rebecca Duell

Clinical Research Coordinator


Kathryn Jelinek

Clinical Research Manager


Muhammad Nasir

Clinical Research Coordinator


Weiping Ye

Clinical Research Coordinator


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