# Steve Heffernan

> Steve Heffernan is the co-founder and product architect at Mux, the developer-first video infrastructure platform, and creator of Video.js - the open-source HTML5 video player powering playback on Amazon, LinkedIn, Instagram, and Dropbox with over 38,700 GitHub stars. Previously co-founded Zencoder (YC W10), the cloud video encoding startup acquired by Brightcove for $30M in 2012. A self-described hacker on video, he is now leading the ground-up rebuild of Video.js v10 at Mux, which raised $105M Series D in 2021.

- **Role:** Co-Founder and Product Architect at Mux
- **Organizations:** Mux, Video.js, Zencoder, Brightcove, Demuxed, Dash Industry Forum
- **Nationality:** American
- **Education:** MBA, Business, Azusa Pacific University
- **Known for:** Created Video.js in 2010, the web's most widely deployed open-source HTML5 video player with 38,700+ GitHub stars, Co-founded Zencoder (YC W10), acquired by Brightcove for $30M in 2012, Co-founded Mux (YC 2016), raising $173.9M in total funding including a $105M Series D

## Career timeline

- **pre-2010** — Webmaster and Internet Marketing Manager at Azusa Pacific University; active in Ruby and Rails communities
- **2010** — Co-founded Zencoder (cloud video transcoding service) with Jon Dahl and Brandon Arbini; joined Y Combinator Winter 2010
- **2010** — Created Video.js - the first open-source HTML5 video player controls - as a weekend project during YC
- **2011** — Video.js officially launched as open-source project under LGPL (later Apache 2.0)
- **2012** — Zencoder acquired by Brightcove for $30M; Heffernan joined Brightcove as Director of Open Player Tech
- **2012-2015** — At Brightcove, worked full-time on Video.js alongside existing player team
- **2015** — Left Brightcove; handed off Video.js lead maintainership to Gary Katsevman; remained on Technical Steering Committee
- **2016** — Co-founded Mux with Jon Dahl, Adam Brown, and Matthew McClure; returned to Y Combinator
- **2018** — Mux launched Mux Data (video performance analytics) and Mux Video (video infrastructure API)
- **2021** — Mux raised $105M Series D (April 2021); total funding reached $173.9M
- **2023** — Media Chrome web components for video/audio players reached v1.0
- **2025** — Mux announced Video.js v10 technology preview (October 2025); Heffernan returns to lead development
- **2026** — Video.js v10 beta released; GA expected mid-2026

## Achievements

- Created Video.js in 2010, the web's most widely deployed open-source HTML5 video player with 38,700+ GitHub stars
- Co-founded Zencoder (YC W10), acquired by Brightcove for $30M in 2012
- Co-founded Mux (YC 2016), raising $173.9M in total funding including a $105M Series D
- Mux reaches $46.1M annual revenue as video infrastructure for thousands of developers
- Led development of Media Chrome (web components for video/audio) to v1.0 in 2023
- Returning lead developer for Video.js v10 - a ground-up rebuild reducing bundle size by 70-80%
- GitHub user #166 - one of the earliest accounts on the platform
- Video.js powers playback for Amazon, LinkedIn, Instagram, Dropbox and major media platforms
- Member of Dash Industry Forum and video-dev communities

## Latest updates

- **2026-02** — Video.js v10 beta released, with GA expected mid-2026
- **2025-10** — Mux announced Video.js v10 technology preview - a ground-up rewrite of the 15-year-old open-source player
- **2025** — Steve returning to lead Video.js v10 development as Mux becomes corporate steward of the project
- **2023** — Media Chrome web components for video/audio players reached v1.0
- **2021-04** — Mux closed $105M Series D funding round

## Links

- Website: https://mux.com
- LinkedIn: https://www.linkedin.com/in/heffernan
- Twitter/X: https://twitter.com/heff
- GitHub: https://github.com/heff

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Profile page: https://yespress.io/steve-heffernan
Published by YesPress — https://yespress.io
Last updated: 2026-05-22