Principal Investigator

Joshua Brown, M.D., Ph.D.

I am a physician-scientist, neurologist, and psychiatrist. Additional to the Brain Stimulation Mechanisms lab, I am medical director of the McLean TMS clinic and TMS research at McLean Hospital, and pending an appointment as Assistant Professor at Harvard Medical School. Bridging my doctoral work in synaptic plasticity with my research fellowship under TMS pioneer, Mark George, my goal is to determine the underlying synaptic-level mechanisms of TMS to guide pharmacologic augmentation and parameter selection strategies and thereby optimize TMS effectiveness. Additionally, I serve on the board of directors and executive committee of the Clinical TMS Society and am recipient of the Brainbox Initiative Young Investigator Award. Our research is made possible due to funding from the NIGMS, NIDA, NIAAA, BBRF, DARPA and private philanthropy.

Program Coordinator

Dennis Guevara

I am the Program Coordinator for TMS Research and the Brain Stimulation Mechanisms Laboratory within the Division of Depression and Anxiety Disorders at McLean Hospital. My focus is to help manage and facilitate various aspects of the TMS Program including overseeing logistics, fostering effective communication, collaboration, and ensuring successful program execution. I enjoy salt water fishing (stripers!), and family time (games/movies).

Lab Manager


I’m from the Bay Area, but I have been in love with the harsh Boston winters and its people ever since I moved here over 10 years ago. I completed my Master’s in Nursing from Regis College in Weston, Massachusetts in 2022 and have continued at McLean Hospital since. I am passionate about individualizing treatment options to better suit patient’s needs and offer meaningful interventions for debilitating symptoms.


Mahdi Razafsha, M.D.


Andy Fukuda, M.D., Ph.D.

Clinical Research Assistant

Jamie Kweon, B.S.

I graduated from Boston College (’21) with a Bachelors of Science in Neuroscience and a minor in music. My research interests are sleep and psychiatric disorders. I study TMS mechanisms using neurophysiology. When I am not in lab I like to play violin and listen to music.

Technical Research Assistant

Prem Ganesh, B.S.

I graduated from Temple University (’23) with a Bachelors of Science in Bioengineering and am currently pursuing a Masters of Science in Bioinformatics from Northeastern University. My research interests are parameter space in TMS and computational biology.

Data Science Intern

Lamaan Haq

I am an intern working on clinical data sets. My research interests lie at the intersection of Data Analysis and Psychiatry, with a focus on improving clinical outcomes. I enjoy reading and watching/playing sports.

Post-doctoral Research Fellow

Hakjoo Kim, Ph.D.

In 2024, I obtained my Ph.D. in Kinesiology with an emphasis in Motor Neuroscience from Texas A&M University. My research has primarily focused on various types of non-invasive brain stimulation techniques and their implications for human motor learning. Currently, I am continuing my research journey at McLean Hospital, where I am investigating the mechanisms underlying transcranial magnetic stimulation and its potential applications in clinical populations.

Join Our Team

The Brain Stimulation Mechanisms Lab is looking for motivated individuals that have a strong interest in neuromodulation research. Our lab is highly collaborative and teamwork is essential.

Undergraduate Students:

  1. Interest in preclinical or clinical lines of inquiry
  2. Strong academic background
  3. We are of the mindset that anyone with interest and a dedicated approach can get involved in research

Post-Doctoral Fellows:

  1. Strong interest in psychiatry, neuromodulation, neurophysiology, computational modeling, and TMS parameter space
  2. Strong publication record