Heidi Roizen

Heidi Roizen

VC

Partner, Threshold Ventures

Recovering entrepreneur and venture capital partner

Menlo Park, CA2 notable investments
SeedSeries ASeries B+
Enterprise SaaSConsumerAIHealthcare

Background

Heidi Roizen is a Partner at Threshold Ventures and a veteran of Silicon Valley, having co-founded software company T/Maker and served as its CEO for over a decade before its acquisition. She spent a year as VP of Worldwide Developer Relations at Apple before entering venture capital in 1999, first at DFJ and then co-founding Threshold. She co-leads Stanford's Threshold Venture Fellows Program and serves on advisory councils at Stanford HAI and STVP.

Investment Focus

Stages

SeedSeries ASeries B+

Sectors

Enterprise SaaSConsumerAIHealthcare

Based in: Menlo Park, CA (North America)

Notable Investments

Last updated: Jun 11, 2026