Mark's journey in software development began with writing an IRC bot and grew into a career driven by a passion for open source. His early work in mobile-focused open source projects in the pre-iPhone era led to an early role at Twitter, where he helped develop their first mobile products. Later, as CTO at Snip.it, acquired by Yahoo, he focused on integrating Tumblr into the Yahoo platform as a software architect. At 1984, Mark assesses potential investments and aids portfolio companies in executing on their technical visions. He can be found on GitHub where he maintains several popular open source libraries and has contributed to more than 200 others.