HERE COME
THE OUTSIDERS
We are singularly dedicated to reaching, engaging, and helping humans working or living with brain conditions.
Otherside is a neuroscience agency and community platform that brings together world-class agency leadership, deep clinical and commercial expertise, and the irreplaceable authority of lived experience — to change what it means, commercially, clinically, and culturally, to live with a brain condition.
WE PARTNER WITH NEUROSCIENCE’S BEST ORGANIZATIONS, BUILD AND EVOLVE ITS BEST BRANDS, AND RELENTLESSLY PURSUE A BETTER FUTURE FOR PEOPLE LIVING WITH BRAIN CONDITIONS.
Friends & Partners
Who We Are
Integrating lived experience
at every step.
That's our founding lens.
The humans leading our agency don't just understand brain conditions — they've lived inside them, been shaped by them, and built communities around them.
Mark Slater is an award-winning writer, strategist, creative director, and agency leader with more than two decades of experience building brands, businesses, and narratives across healthcare and beyond.
He has partnered with hundreds of healthcare organizations, ranging from early-stage startups to several Fortune Ten companies. His leadership spans agency, consultancy, and advisory roles, defined by strategic rigor, emotional intelligence, and a deep respect for both science and lived human experience.
Mark is also a person with epilepsy. He serves on the board of the Pediatric Epilepsy Research Consortium, is a leading voice in the campaign for a National Plan for Epilepsy, and advises organizations across the global neuroscience ecosystem.
He is the founder of Otherside, the world's first agency dedicated exclusively to neuroscience branding, strategy, and marketing. In 2025, he launched the Otherside Lounge, a first-of-its-kind pop-up activation designed to connect people living with epilepsy at conferences and events around the world.
Jon Nelson is a marketing executive, entrepreneur, and fierce mental health advocate with more than two decades of experience leading communications, strategy, and business growth across the healthcare ecosystem.
Jon is a connector, culture builder, and strategist across biopharma, medtech, and healthcare organizations.
Jon is also living a "bonus life," made possible by breakthrough neurotechnology. After living with severe depression, he underwent experimental deep brain stimulation and achieved remission.
Today, he is one of the most trusted lived-experience voices in the global mental health and neuroscience community.
Jon's advocacy has been featured on Science News, Capitol Hill, NPR, Bloomberg, and international broadcast platforms.
Seizures (epilepsy)
+Sadness (treatment-resistant depression)
+Four decades of healthcare expertise
+A world-class team and network
=Otherside.
What We Do
WHAT WE DO
THAT OTHERS CAN'T.
Every engagement is built around the human living with the condition.
