We are a Carmel-based neurofeedback therapy clinic that helps adults and children mitigate the symptoms related to anxiety, depression, post-traumatic stress disorder, attention deficit disorder, attention deficit hyperactive disorder, apraxia, and migraines.

We are parents with kids who have different needs and struggles, and we are grown adults with those same things, too.

Our data-driven, brain-based assessments and training programs help children and adults improve concentration, memory, sleep, mood, behavior, and stress management.

Life can be hard. Let us help.

Courtney Boyer, RN | Founder of Grey Matters with Grey

Courtney Reimmuth, RN | Founder

Courtney is the founder of Grey Matters. She has over 20 years of experience in business management, nursing, psychology, nutrition, and digital marketing. She’s also Grey’s mom, so she gets it! As a mother with a child living with apraxia and ADHD, Courtney has found success in neurofeedback for both herself (cPTSD) and her children. Now, she’s out here helping other moms and dads with their own mental health struggles.

Courtney holds an active Registered Nurse license in Indiana, and she is a Certified Brain Health Coach, Certified Health and Wellness Coach, and a Certified Holistic Nutritionist. Additionally, Courtney is trained in Infraslow Fluctuation (ISF), IFEN, and sLoreta Neurofeedback, as well as qEEG acquisition and analysis. All of this wrapped up together makes her the perfect mental health advocate here at Grey Matters.

Devin Reimmuth, RN Clinic Manager at Grey Matters of Carmel

Devin, RN, BSN | Clinic Manager

Devin is our rockstar Clinic Manager who keeps things running in tip-top shape. She joined us at Grey Matters of Carmel in the summer of 2022 after leading a team of 150 oncology nurses at the University of California – San Diego. Devin graduated from Purdue University in 2009 with a bachelor’s degree in Public Relations and Rhetorical Advocacy and again in 2014 from the University of Louisiana-Lafayette with her bachelor’s degree in nursing.

Devin is trained in Infraslow Fluctuation (ISF) Neurofeedback, qEEG acquisition, 19-channel Neurofeedback, and Gut Microbiome Modulation.

Kristin Vance Brain Health Coach at Grey Matters of Carmel

Kristin | Success Coach

Kristin is a Masters-Level Mental Health Counselor who joined our team after seeing the success neurofeedback training at Grey matters had with her son for post-concussion syndrome mitigation. Kristin is a true gem for our friends who have a few extra needs during their time here at Grey Matters of Carmel. If a soft voice and a heart of compassion are what you’re looking for to help you get through, she is your coach. You will meet Kristin at the beginning of your journey at Grey Matters of Carmel to set goals, work with your gut health, and is available for coaching sessions as well.

Kristin is trained in Infraslow Fluctuation (ISF) Neurofeedback, qEEG acquisition, and gut microbiome health.

Grey Matter staff

Sydnie | Happiness Engineer

Sydnie is our resident mad scientist! With a bachelor’s degree in biology, she loves to optimize brains in a scientific way. You can find this rockstar in our Carmel and Greenwood (coming January 2024) training centers.

Sydnie is trained in Infraslow Fluctuation (ISF) Neurofeedback, qEEG acquisition, and 19-channel Neurofeedback.


Audrey | Happiness Engineer

Audrey is our local ‘Hoo-Hoo-Hoo’ Hoosier, graduating from Indiana University with a degree in Human Biology and Gender Studies.

Audrey is trained in Infraslow Fluctuation (ISF) Neurofeedback, qEEG acquisition, and 19-channel Neurofeedback. 

Grey Matters Assistant

Charley | Neurofeedback Assistant

Charley is one of the coolest people you will ever meet. Although she’s still in high school, Charley’s passion for helping people and her deep interest in human behavior and psychology make her the perfect Neurofeedback Assistant. She is currently pursuing her CNA and EMT certifications.

As Courtney’s daughter and a neurofeedback graduate herself for concussion and OCD mitigation, Charley couldn’t be happier to join in on this journey of bringing relief and an optimal life to many others.

Macy Marie Therapy Dog

Macy Marie | Chief Hug Officer

Macy Marie is Chief Hug Officer at Grey Matters. She is a hypoallergenic, loving Australian Labradoodle who loves to give hugs, comfort our friends, and get belly rubs. She earned her Good Canine Certification in November 2021, is a full-access Service Dog, and furthered her training in June 2022 with K9 training. 

When Macy is not working she likes to play fetch, go on long walks, and learn new tricks.

“Almost any brain, regardless of its level of function, can be trained to function better.”

“Almost any brain, regardless of its level of function, can be trained to function better.”

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