LEADERSHIP TEAM

Ryan E. Radwanski, MD
Chief Executive Officer
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Ryan is a U.S. Marine who served with 1st Battalion, 11th Marines in Helmand Province, Afghanistan. During four years of active, enlisted service Ryan was meritoriously promoted three times, was awarded the Naval Achievement Medal, and earned a combat action ribbon in theater. Ryan was honorably discharged from the U.S. Marine Corps in 2012.

Ryan completed his undergraduate studies in Neurobiology and Behavior at Cornell University and received his MD degree with Honors in Service from Weill Cornell Medical College. Ryan founded the first planning committee for Medical Student Neurosurgery Training Camps in 2017 - a multi-site national training program that has since grown into the Medical Student Neurosurgery Training Center.  As the Executive Director of the Training Center, Ryan is at the forefront of our mission to pioneer new learning  opportunities in neurosurgery.
Susan C. Pannullo, MD
​Director of
​Medical Student Education
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Dr. Susan C. Pannullo is the Director of Neuro-oncology and the Director of Neurosurgical Radiosurgery at New York Presbyterian - Weill Cornell Medical Center. Dr. Pannullo is board-certified in both neurology and neurological surgery and has served as the faculty adviser for the Weill Cornell Medicine AANS Medical Student Chapter since its inception. She has mentored countless students through the AANS Medical Student Chapter and played a critical role helping medical students launch the flagship Medical Student Neurosurgery Training Camp at Cornell.
Jeffrey P. Greenfield, MD PhD
Faculty Director
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Dr. Greenfield is a board-certified neurosurgeon who specializes in pediatric neurosurgery. Compassionate clinical care, research, and education are all central to his philosophy as a neurosurgeon and physician. Dr. Greenfield graduated from Amherst College magna cum laude in Neuroscience before receiving his M.D. and Ph.D. degrees from the Weill Medical College of Cornell University. Following completion of his neurosurgical residency at New York-Presbyterian Hospital/Weill Cornell Medical Center, Dr. Greenfield completed a pediatric neurosurgery fellowship at The Children’s Hospital of Philadelphia.

Dr. Greenfield has won multiple teaching awards from residents and students. He directs the medical student interest groups and the rotations for medical students on the neurosurgery service at Weill Cornell Medicine and was named Vice Chairman for Academic Affairs in 2017. For the past decade he has been the associate residency director and direct he resident curriculum and education. He has co-edited three text books and written over 100 articles.
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As Faculty Director of the Medial Student Neurosurgery Training Center, Dr. Greenfield works with our team of directors to ensure our educational programing in neurosurgery is consistently innovating and adding value to medical student’s education across the world.
Iyan Younus, MD
Resident Associate Director
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Iyan Younus, MD received his medical degree from Weill Cornell Medicine in 2020 with Honors in Research. He obtained his undergraduate degree from Texas A&M University graduating summa cum laude. At Cornell, Iyan conducted epilepsy research with funding from the American Association of Neurosurgeons (AANS) research fellowship. His work investigated the network theory of focal seizure propagation. He also had multiple publications and national presentations on outcomes, complications, new approaches, and the surgical learning curve in endoscopic skull base surgery. Iyan is co-founder of the medical student neurosurgery training camp and involved in multiple projects for improving and facilitating career preparation for future neurosurgeons. Iyan will begin his Neurological Surgery residency at Vanderbilt University in July 2020. Iyan is an avid sports fan, especially football and basketball.
Graham Winston, MD
Resident Associate Director
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Graham Winston, MD received his medical degree from Weill Cornell Medicine in 2020 with Alpha Omega Alpha (AOA) honors distinction. He obtained his undergraduate degree from Northwestern University. As a medical student, he helped spearhead the Medical Student Neurosurgery Training Camps. Graham works in the laboratory of Dr. Michael Kaplitt investigating use of MR-guided focused ultrasound to deliver gene therapy for neurodegenerative diseases and neuro-oncology. He has also worked on research in the fields of cerebrovascular surgery, spine surgery, functional neurosurgery as well as numerous projects pertaining to medical student education. Graham will begin his Neurological Surgery residency at NewYork-Presbyterian Weill Cornell in July 2020. Outside of his academic interests, Graham is a runner, New York sports fan, and practices both yoga and meditation.
Michael Rothbaum
Student Associate Director
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Michael Rothbaum completed his undergraduate education at Cornell University where he majored in Comparative Literature and Spanish. Upon graduating, he spent two years at Weill Cornell as the coordinator for an NIH-funded study investigating the role of topical vancomycin in craniotomy wound prophylaxis. He is currently a fourth year medical student at New York Medical College where he serves as the president of the AANS medical student chapter and is active in clinical neurosurgery research. As the Student Director for the Training Camp, Michael is responsible for developing first-class content for each of the hands-on and virtual courses as well as ensuring their smooth execution. Michael is also passionate about his various volunteer positions, his role on the American Heart Association NYC Young Professionals Board, and his work as a private tutor. On weekends you can find him running or cycling in Central Park, visiting the Whitney, or experimenting with new recipes in the kitchen. He plans to pursue a career in neurosurgery.
Sergio W. Guadix
Student Associate Director
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Sergio W. Guadix is a medical student and President of the AANS student chapter at Weill Cornell Medical College. He is passionate about creating opportunities for students to engage with the field of neurosurgery and works closely with faculty to achieve this goal. His position as Director of Grant Acquisition for Brain and Spine Group allows him to further this passion, expanding opportunities for students to gain exposure to the field of neurosurgery and the behavioral sciences on a national scale.

Sergio earned a B.A. in cognitive science and graduated magma cum laude from the University of Pennsylvania in 2017. He has diverse research experience, spanning the areas of psychology, consumer behavior, neuroscience, and neurosurgery. His grant writing acumen has been integral to the infrastructure and organization of Medical Student Neurosurgery Training Camps.
Nathan Shlobin
Student Associate Director
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Nathan Shlobin, BA, is a medical student, co-founder of the Neurological Surgery Interest Group, and research student in the Department of Neurological Surgery at the Feinberg School of Medicine, Northwestern University. He obtained his undergraduate degree from Northwestern University in Biological Sciences (Molecular and Developmental Neurobiology) and Psychology with a minor in Global Health. Nathan is interested in the intersection between neurosurgery and ethics, global health, and health policy, as well as educational innovation in neurosurgery. He hopes to provide students interested in neurosurgery with resources, guidance, and connection to each other. 
​FINANCE TEAM
Mark Corey, JD
Chief Financial Officer
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Mark Corey founded and runs 45 Capital Management, an investment advisory firm specializing in building an assortment of hedged portfolios through the use of derivatives.  He founded the firm in 2015 after putting aside his law career in order to follow his dream of running his own investment fund. 

Prior to running his own firm, Mark worked at a patent law firm where he focused on intellectual property, specifically in patent prosecution.  While attending law school, he worked at Arizona Technology Enterprises (AzTE), the technology transfer office of Arizona State University, under their Life Science Department. 

Mark received his Juris Doctor from Sandra Day O’Connor College of Law at Arizona State University.  He also received a Law, Science, and Technology Certificate specializing in Intellectual Property. He earned his bachelor’s degree in Biology from Arizona State University. 
Sergio W. Guadix
Director of Grant Acquisition
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Sergio W. Guadix is a medical student and President of the AANS student chapter at Weill Cornell Medical College. He is passionate about creating opportunities for students to engage with the field of neurosurgery and works closely with faculty to achieve this goal. His position as Director of Grant Acquisition for Brain and Spine Group allows him to further this passion, expanding opportunities for students to gain exposure to the field of neurosurgery and the behavioral sciences on a national scale.

Sergio earned a B.A. in cognitive science and graduated magma cum laude from the University of Pennsylvania in 2017. He has diverse research experience, spanning the areas of psychology, consumer behavior, neuroscience, and neurosurgery. His grant writing acumen has been integral to the infrastructure and organization of Medical Student Neurosurgery Training Camps.
Carlo Castillo
Grant Development
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Carlo Castillo is a rising junior at Cornell University majoring in Biological Sciences with a concentration in Neurobiology and Behavior, pursuing minors in Business, Infectious Disease Biology and Fungal Biology. He has interned in Tourette Syndrome research at Harvard Medical School and has had various shadowships at Columbia University College of Physicians and Surgeons. He hopes to continue to medical school upon graduation.
As a member of the grant acquisition team, Carlo is actively looking for, and submitting applications for grants that follow the mission of the Brain and Spine Group.
Amy Brotherton
Director of Fundraising
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Amy Brotherton is an events and marketing specialist from Columbus, OH. She is a promotions assistant at an independent non-profit radio station, 104.9 the River focusing on engaging the Columbus community in unique ways with each of their partnerships and appearances.

Amy has a BA in Broadcasting Communication and Journalism from Cedarville University. She is dedicated to creating connection points between organizations and the people who love and need them which is what she  brings to our donor relationships at Brain and Spine Group.

Amy spends her free time indulging in experimental baking projects, Taco Tuesdays as well as time with family, friends and her puppy. She says Bon Appetit and enjoys the Great British Baking Show - she hopes to one day master the art of bread-baking.
COMMUNITY ENGAGEMENT TEAM
Alvin Onyewuenyi​
​Team Leader
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Alvin Onyewuenyi, MPH is a medical student and Founder of the AANS student chapter at Chicago Medical School, Rosalind Franklin University of Medicine and Science. He obtained his undergraduate degree from Johns Hopkins University in Public Health Studies and went on to receive a Master of Public Health from Southern Illinois University before starting medical
school. Alvin is very passionate about the use of social media and technology to engage medical students in neurosurgery education. He currently works on the social media team for The Neurosurgical Atlas by Dr. Aaron Cohen Gadol as a social media content creator. Within neurosurgery, Alvin has current interests in pediatrics, stereotactic radiosurgery, and skull base.
Danielle Golub, MD, MSCI
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Danielle Golub is an incoming neurosurgery resident at Northwell Health in New York, where she is excited to pursue her passions for neuro-oncology and skull base surgery under the phenomenal mentorship of Dr. Michael Schulder and Dr. Amir Dehdashti. She is a recent graduate of the NYU Grossman School of Medicine where she received both her MD and a Master of Science in Clinical Investigation (MSCI) through the NIH-funded Clinical and Translational Science Institute. At NYU, she was a member of Dr. Dimitris Placantonakis’s laboratory of neurosurgical stem cell research where she studied the genetics and epigenetics governing gliomagenesis. She received her bachelor’s degree in Cognitive Neuroscience from the University of Pennsylvania where she first discovered her interest in neurobiology while working in Dr. Harvey Grill’s laboratory of regulatory systems neuroscience and obtained multiple institutional grants for her thesis work. Additionally, she is an enthusiastic mentor for her peers, other medical students, and undergraduates interested in neuro-related clinical and basic science research and, over the past few years, has curated her own multi-institutional NY-based research team that has collaborated on countless academic works. She is honored to serve on the social media team for Brain and Spine Group, a team that shares her passion for student mentorship and collaboration in neurosurgical research.
Victoria Alkin
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Victoria Alkin is a freshman pre-medical student at Cornell University studying Neurobiology and Behavior. On campus she is a committee chair of the Cornell Undergraduate Research Board and will be starting research at a neurobiology lab examining the genetic and molecular basis of epilepsy in the fall. She is also partaking in a summer internship at the Allen Institute for Brain Science. In her spare time, she is a singer/songwriter and enjoys reading and running. Victoria is very excited to volunteer with Brain and Spine Group.
Lana Aldos​
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Lana Aldos is a Junior pre-med undergraduate student at Cornell University. She is currently studying Communication and Biology & Society. Her current interests are health and social behavior. Lana is involved in projects pertaining to health in refugee camps with main interests including the prevalence of infectious disease among refugees. She intends to use her education and background experience to bring awareness to the healthcare crisis occurring in refugee camps and among refugees. Her research in health communication highlights a prime way to prevent the spread of infectious disease. Lana aspires to be a medical doctor committing her life to service and helping those in need.

As the Social Media Manager for Brain and Spine Group, Lana curates engaging content across multiple platforms to bolster the flow of quality information among the brain and spine community.
 Sally X. Liu​
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Sally is a third-year pre-med undergraduate student at Cornell University. She majors in Biological Science with a concentration in Neurobiology and Behavior. On campus, she is a part of EARS, MEDLIFE, and PCAT, organizations that guide her to be a better listener/communicator and minimize gaps in the healthcare system. She is also a research assistant who works on a project about decision-making, human development, and health. During her free time, she enjoys listening to music, ice skating and cooking.

She hopes to explore new fields with the Brain and Spine Group and to  elaborate all the knowledge she acquires back to medicine. Her goal is to become a medical doctor who deeply cares about people’s mental and physical issues. With a medical license, she hopes to benefit people who cannot access regular practitioners. ​