People
Castellanos Coaching
Executive function, practical independence, education, and support for neurodivergent teens, adults, and families.
People
Ventures
Current practices and selected projects.
A concise directory for the six connected areas of Greg's work, plus selected ventures and projects that show the range.
Filter by area
Current Practices
Six active pathways.
Each practice is a doorway into a clearer conversation.
Ideas
Castellanos Consulting
Strategy and project development for ambitious ideas, unusual opportunities, and complicated plans.
Ideas
Brands
Castellanos Creative
Brand strategy, messaging, websites, presentations, identity direction, and creative support.
Brands
Technology
AI You Trust
Human-centered AI, digital tools, creative technology, education, and responsible adoption.
Technology
Experiences
Recreation Experiences
Events, retreats, sound, production, and community gatherings shaped with intention.
Experiences
Places
Make Places Better
Creative property stewardship, beautification, hospitality, guest readiness, and thoughtful activation.
Places
Selected Ventures And Projects
A few public anchors.
Simple proof points, not a complete archive.
Recreation Sound Systems
An original sound, product-invention, and event-production venture connecting audio design, product development, entrepreneurship, branding, technical production, and gatherings.
Greg's role: Founder, inventor, producer, and technical director, 2013-2020
The work produced two U.S. design patents: a portable sound system and a portable yoga block speaker.
Patents: D739,846 Portable sound system ยท D815,617 Portable yoga block speaker
BrandsTechnologyExperiences
Local Maker Mart
A nonprofit arts and maker hub in North Beach, San Francisco, built to connect participation, commerce, learning, and community in one physical place.
Greg's role: Founder, CEO, and program director, 2019-2022
Owned facility acquisition, nonprofit governance, grant writing, partnerships, youth STEAM programming, and community-facing events that engaged hundreds of artists and makers.
Coverage: Historical Local Maker Mart article
PeopleIdeasBrandsTechnologyExperiencesPlaces
TechShop STEAM and Maker Education
Hands-on STEAM curriculum and project-based learning built around fabrication, technology, design, creativity, and practical problem solving.
Greg's role: Curriculum designer, educator, and program developer, 2014-2019
Taught hundreds of learners, designed project-based sequences across 2D/3D design, laser cutting, CNC, 3D printing, and electronics, and co-designed TechShop Inside, a mobile makerspace for underserved communities.
PeopleIdeasTechnology
Castellanos Coaching
Executive-function coaching for Autistic and ADHD clients, including Regional Center and Self-Determination Program participants.
Greg's role: Founder and executive-function coach, 2020-present
Served 30+ clients cumulatively since 2020, building person-centered plans and individualized progress tracking around college, employment, and independent-living readiness.
People
Enterprise Event Production
More than fifteen years of work across live sound, video, playback, show calling, technical direction, and complex event operations.
Greg's role: Technical director, audio and video professional, show caller, producer, and production partner
Supported productions for Google, Stripe, Atlassian, GitHub, Nasdaq, SF MoMA, and the World Economic Forum through these production companies; manages 200+ slide decks per show and live cue-to-cue workflows.
TechnologyExperiences
Shangri-La Sonoma
A Sonoma retreat center where Greg has supported event production, web design, guest-experience thinking, and place-readiness.
Greg's role: Creative, technical, and experiential contributor
Produced events including Ghost Town Gala 2025 and contributed to hospitality, production, presentation, and guest-experience systems.
IdeasTechnologyExperiencesPlaces
Convergence 2026
A sold-out 250-person, 15-artist production shaped through budget, stage management, and run-of-show leadership.
Greg's role: Executive producer
Owned budget, stage management, and run-of-show for a sold-out 250-person production with 15 artists.
Experiences