Meet The Team Behind Grey Matters

Courtney Reimmuth, RN, is the founder of Grey Matters Brain Training Studio — but before she built a studio, she was a mom searching for answers. When her son, Grey, was diagnosed with apraxia and ADHD, Courtney began pursuing real solutions that offered more than explanations. That journey led her to neurofeedback and inspired her to create the kind of place she wished had existed for her own family.

With more than 20 years of experience spanning nursing, psychology, nutrition, business management, and digital marketing, Courtney brings a unique blend of clinical understanding and heartfelt compassion to Grey Matters. She understands both the science and the emotional weight families carry when they are searching for answers, and she has built the studio to be a place where children, adults, and parents feel supported, understood, and no longer alone.

Courtney leads Grey Matters with a mission to help individuals and families better understand, support, and optimize brain health through compassionate, personalized, brain-based care. She built Grey Matters on the belief that every brain matters, every story matters, and every person deserves hope. Grey matters — and so do you.

Marissa Schoon serves as Studio Coordinator at Grey Matters Brain Training Studio. She brings valuable experience in both TMS (transcranial magnetic stimulation) therapy and ABA therapy, along with a strong passion for helping people improve their mental health and overall quality of life.

Marissa has worked with children, adolescents, and adults in previous clinical roles, including as a Senior TMS Technician and Registered Behavior Technician. She earned her B.S. in Psychology from Indiana State University and is experienced in qEEG acquisition and multiple neurofeedback approaches, including ISF, Z-Score, Amplitude, ROIA, and PZOK.

Known for her calm presence and genuine care for others, Marissa helps create a positive, supportive experience for patients throughout their training journey. Outside the studio, she enjoys exploring local coffee shops, reading, gaming, and spending time with her fiancé and family.

Tina Spanger-Mettjes serves as Success Coach at Grey Matters Brain Training Studio.  She analyzes the raw data, sets and refines custom protocols, and meets with patients to discuss outcomes, recommendations, and next steps. Tina brings extensive international experience in psychotherapy, qEEG analysis, and multiple forms of neurofeedback training.

She is especially passionate about helping individuals heal from trauma and chronic stress, with specialized expertise in PTSD and anxiety. Tina is trained in a wide range of modalities, believing that no single approach is right for every person. Her background includes work as a state-approved educator and social expert, certified psychologist, approved hypnotherapist, NLP Master, biofeedback and neurofeedback therapist and educator.

Tina also studied medicine for four years, runs a clinic focused on objective functional neuroimaging, recently completed her Master’s degree in Clinical Neuropsychology, and is the author of Brodmann Areas Pocket Guide: BAs Made Simple

Charley Boyer is a Neurofeedback Technician at Grey Matters Brain Training Studio with a lifelong passion for psychology, brain health, and helping others grow into the best versions of themselves. As the daughter of founder Courtney Reimmuth, Charley has had a unique connection to Grey Matters and its mission, and she brings both heart and curiosity to her role on the team.

She has been fascinated by the brain and human behavior since high school, and that interest continues to grow through her education and hands-on work in the studio. Charley is currently a Clinical Psychology student at LSU and is expected to graduate in 2027. She is especially passionate about helping women build greater mental awareness, emotional resilience, and personal alignment in their lives.

At Grey Matters, Charley is trained in qEEG acquisition, ISF, Z-Score, and Amplitude neurofeedback. Outside of the studio, she enjoys yoga, reading, journaling, traveling, and finding joy in everyday life.

Jenna Grayson is the friendly face helping create a warm, welcoming experience for patients and families at Grey Matters Brain Training Studio. She studied news writing and broadcast journalism at Columbia College Chicago before returning home to Carmel, Indiana, in 2020.

After college, Jenna began nannying for a local family and quickly discovered a passion for supporting children as they grow, learn, and reach new milestones. That experience led her into preschool education, where she developed a strong appreciation for building positive environments that help both children and families feel supported.

Jenna was drawn to Grey Matters because of its mission and the opportunity to work with both children and adults in a meaningful, people-focused setting. She brings strong interpersonal skills, compassion, and a welcoming energy to the studio each day. Outside of work, Jenna enjoys cooking, watching the Food Network, traveling, spending time with friends, and a little retail therapy.

Talha Khattak supports Grey Matters behind the scenes through digital marketing, website updates, content support, and ongoing technical tasks that help keep the studio’s online presence strong and effective.

At Grey Matters, Talha helps with blog writing, website content updates, support tickets, email campaign assistance, and social media strategy support. His role is especially valuable in helping the team maintain momentum online while ensuring the website and marketing efforts continue to grow in a clear, organized, and professional way.

Talha is known for being dependable, detail-oriented, and eager to support the mission of Grey Matters through thoughtful digital work that helps connect more people to the services and hope the studio provides.