John Meissner is a climate and energy startup leader who currently serves as Head of Growth at Zero Homes and as a co-founder and board chair of LabStart. In 2024 they were interim executive at Zero Homes, where they helped launch Zero 2.0, hired 10 FTEs, built a leadership team, validated product-market fit, and achieved $500k in monthly sales. They founded MXV Ventures (2019–2021) and Canvas Innovations (2015–2021), and they served as a venture partner at Impact Venture Capital (2021–2023). They were CEO of Ascent OS (2021–2023) and attended the University of California, San Diego from 1998 to 2003.
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