Marcus Rein

Atlanta, GA

Marcus Rein

Community Manager at Mozilla

I help developers get started and actually stick around. For the past six years I've done developer relations and community work in crypto and open source: workshops, a weekly livestream, docs, and a lot of answered questions. Before tech, I played seven years on the U.S. Youth Men's National Soccer Team, then spent a decade as a physical therapist where I learned to educate and motivate professionally. On the side, I write and make music.

I write at Substack, release music as Mark Mohr, and shoot photography. Open to collaborate on music — mixing, mastering, or production. Get in touch.

Work

  1. Community Manager · Mozilla

    2026 —

    Just started. Helping grow and support the developer and open-source community.

  2. Senior Developer Relations · Edge & Node

    2022 — 2026

    Ran the Edge & Node Twitter and led developer go-to-market for Amp and Hypergraph. Hosted 140+ episodes of Builders Office Hours, ran podcasts, hackathons, and workshops, and built community both online and IRL through thehousesf.ai. Wrote the quickstarts that got new developers onto The Graph.

  3. Developer Relations · Soulbound Labs

    2020 — 2022

    Taught myself to build subgraphs, then used that to onboard other developers. Made tutorials and videos and started the SoulSpeak Podcast.

  4. Doctor of Physical Therapy

    2013 — 2021

    Ran a clinical team for eight years. This is where I got good at explaining hard things to people who didn't ask for a lecture.

  5. Founder · Santa Cruz Functional Fitness

    2009 — 2013

    Founded and ran a functional-fitness gym in Santa Cruz.