Seth Hallen is Founder and Managing Partner of Hallstone Ventures, a seed-stage venture firm backing founders building AI-driven infrastructure for media, entertainment, advertising, and the modern attention economy.
Before founding Hallstone, Seth spent more than 25 years building and leading media technology businesses across production, post-production, localization, distribution, and enterprise media workflows. His career includes leadership roles at Panavision's Light Iron, Sony Pictures, Pixelogic, and Testronic, as well as nine years as President of the Hollywood Professional Association.
Today, his work is focused through Hallstone Ventures, where sector focus and an engaged operator network help founders navigate the buyer, budget, workflow, and integration realities that define media and advertising infrastructure.
Selected writing and conversations
- Where the Money Moved
- AI Makes Code Cheap. Judgment Becomes the Moat.
- Courageous Transformation: What Leadership Looks Like When the Playbook Changes
- Beyond the AI Bubble: Why Sector-Focused Investors Win at the Application Layer
- Funding the Media Stack — Future Frames with Andy Beach
- AI Capital: Betting on the Next Media Stack — Silicon Valley Video Summit