Greg Smithies

Founder, Investor, Farmer, not necessarily in that order.

📍 San Francisco Bay Area, United States🔄 Updated September 2026💼 31 investments📅 15 years investing🗓 Last invested Nov 2022𝕏 @upgrade_to_unlock
VC🌍 United States20+ investments
31
Total investments
5
Early stage
9
Mid stage
5
Late stage
15y
Years active

Portfolio

25 investments · sorted by recency
All investments
Early stage
Mid stage
Late stage
Investor
Aug 2022
Mojave is changing the nature of air conditioning. Air conditioning has become critical to productivity and comfort in our indoor environments. As a result, it accounts for about 10% of total global electricity use and emits one billion tons of carbon dioxide. What if we could maintain the same comfort, reliability and purchase costs while lowering energy consumption and emissions? Since its invention in 1902, air conditioning has relied on vapor compression which over time has become progressively more efficient at lowering air temperature, but remains inefficient at humidity control. At the same time, modern building codes, ventilation requirements, and efficient appliances have reduced temperature loads but increased humidity loads. That means buildings today use more energy to control humidity than temperature. Mojave's ArctiDy introduces a patented way to solve this problem.
Investor
Apr 2022
Brimstone is on a mission to decarbonize the cement industry, which today is responsible for 7.5% of carbon emissions annually. Founded in 2019, Brimstone developed a breakthrough decarbonized process to produce the same ordinary portland cement and supplementary cementitious materials used today. These materials have the same quality and performance builders have trusted for decades — now with a positive climate impact.
Investor
Apr 2022
SOURCE's technology provides safe, clean drinking water for industrial, commercial, residential and community applications. Their groundbreaking SOURCE® Hydropanel taps into the endless supply of solar energy and moisture in the air, producing drinking water entirely off-grid in a self-contained system. This revolutionary technology will do for drinking water what solar panels have done for electricity, making water a renewable resource. SOURCE® Hydropanels are currently at work in more than 40 countries across the world. Own your water with SOURCE®. Visit: www.source.co Call: 1-855-796-9283
Investor
Mar 2022
Enabling electrification for all ⚡
Investor
Mar 2022
Assembly is on a mission to make urban development more scalable and sustainable. Novel technology, enabling aerospace levels of precision, allows us to design and deliver high-rise buildings quickly, at less cost, and more efficiently than ever before. Assembly buildings are custom, imaginative, green, and peerless in quality—all while creating market-driven affordability, enabling diverse participation in building delivery, and bringing design excellence to more and more communities.
mid stageReal Estate
Investor
Jan 2022
Twelve™ produces fuels and feedstock for thousands of everyday products from CO2 and electricity. This is eManufacturing—advanced industrial technologies that change the way we make things from the molecule up. A world made from air™
Investor
Sep 2021
Clarity AI brings societal impact to markets. We build-in a customizable, scalable sustainability tech kit to your existing workflow, which empowers you to efficiently and confidently assess, analyze and report on anything valuable to your clients and everything required by law. Add Clarity. Choose Sustainably.
Investor
Sep 2021
Here at Remilk, we’ve made it our mission to create real dairy without a single cow, bringing a message of hope and joy to our planet, our body… and cows!
Investor
Aug 2021
ICON is a construction technology company developing robotic and AI systems to lower the cost and increase the speed and quality of construction to tackle the global housing crisis and prepare to build on other worlds. As a pioneer of large-scale 3D printing, ICON continually sets new standards for delivering resilient, dignified housing and recently unveiled a radical new robotic printer that enables multi-story construction, a new low-carbon building material, a digital catalog for residential architecture, and an AI architect for home design and construction. Using proprietary 3D printing robotics, software and advanced materials, ICON is shifting the paradigm of homebuilding on Earth and beyond. For more information visit www.iconbuild.com or follow on X™, Instagram®, Facebook®, YouTube®, or Threads® (@ICON3DTech).
mid stageConstruction
Investor
Aug 2021
Plant-based dairy alternatives that are good for you and good for the planet. We are dedicated to changing the standard of what plant-based foods can be. 🌱 Plant-Based Milks and Protein Shakes 🌱 Created by the genius of plants 🌱 Certified B-Corp 🌱 Top 8 Allergen-Free 🌱 Vegan and Certified Non-GMO
Investor
Jun 2021
Sealed is a climate tech company on a mission to stop home energy waste by enabling contractors to install more home weatherization and electrification projects and grow their businesses.
Investor
Feb 2020
We turn renewable electricity & atmospheric CO2 into zero net carbon gasoline, diesel, and jet fuel.
Investor
Jan 2020
At GXC, we’re transforming the way businesses connect with our turnkey private 5G and LTE solutions. We make it easy for enterprises to take full control of their networks with seamless integration and simple management. Why GXC? Ready-to-Deploy Solution: Our turnkey system is quick to set up and manage, saving time and resources. Cost-Effective Integration: Our solution fits right into your existing infrastructure without breaking the bank. Streamlined Management: Our Enterprise Management System gives you real-time control over your entire network. Future-Ready, Flexible, and Secure Advanced Mesh Technology: Extend coverage easily without relying on traditional wired backhaul. Durable and Versatile Equipment: Built to perform in any environment—indoors or out. Dual-Band Capability: Future-proof your investment with technology that’s ready for 4G LTE and 5G. Strong Security and Seamless Integration Top-Tier Security: Our networks are secured with cellular-grade encryption to protect your data. API Support: Easily integrate with your current systems for smooth, proactive network management. We’re simplifying enterprise connectivity with private 5G. Learn more at www.gxc.io.
Investor
2020
PureCycles patented purification recycling technology, developed by The Procter & Gamble Company, is designed to transform polypropylene plastic waste (designated as No. 5 plastic) into a continuously renewable resource. Our unique purification process removes color, odor, and other impurities from No. 5 plastic waste resulting in an ultra-pure recycled (UPR) plastic that can be recycled and reused over and over again, changing our relationship with plastic.
Investor
2019
Accelerate Additive Manufacturing Accuracy with 3D Reality. Riven is an open cloud software company accelerating high-precision additive manufacturing. Our Warp-Adapted-Model (WAM) software applies proprietary 3D reality intelligence to correct and prevent dimensional defects. Riven enables OEMs and service bureaus to meet demanding quality specifications at production scale and expands additive manufacturing applications. Riven is used across a variety of additive manufacturing methods including MJF, FDM, SLA and metal binder jetting.
Show all 25 investments ↓
Experience · 36 entries
All (36)
Investments (31)
Founder (3)
2026
Co-Founder & Managing Partner
Jan 2026
Rising Tide builds wealth creation products for Startup Founders in the Post-AI world. We fundamentally believe that the world would be a better place if we had more startup founders tackling humanitys toughest problems. Unfortunately - the risk and financial burden of becoming a founder keeps some of the best and brightest from ever doing it. By directly targeting the biggest hurdles to becoming a founder by creating: - less downside, - more upside, and - faster liquidity We believe we can bring more of the worlds best minds to bear on humanitys toughest problems.
Co-Founder
2026
TimelyAI is building a Marketing Saas for Time-based Businesses. “The idea is to solve the most burning need of our customers- Growing their clientele at an affordable price and being able to build lasting relationships with them for repeat business and referrals.” "Coming soon with something extremely crazy!"
2022
Investor
Nov 2022
Runwise is the countrys #1 smart operating system for buildings. Installed 100% wirelessly, and in 1 day or less, the platform runs the key heating, cooling, electric and water systems in over 10,000 buildings more intelligently. The result is 20% lower operating costs and carbon output, while making the building safer, cleaner, more comfortable and easier to manage.
Investor
Aug 2022
Mojave is changing the nature of air conditioning. Air conditioning has become critical to productivity and comfort in our indoor environments. As a result, it accounts for about 10% of total global electricity use and emits one billion tons of carbon dioxide. What if we could maintain the same comfort, reliability and purchase costs while lowering energy consumption and emissions? Since its invention in 1902, air conditioning has relied on vapor compression which over time has become progressively more efficient at lowering air temperature, but remains inefficient at humidity control. At the same time, modern building codes, ventilation requirements, and efficient appliances have reduced temperature loads but increased humidity loads. That means buildings today use more energy to control humidity than temperature. Mojave's ArctiDy introduces a patented way to solve this problem.
Investor
Apr 2022
Brimstone is on a mission to decarbonize the cement industry, which today is responsible for 7.5% of carbon emissions annually. Founded in 2019, Brimstone developed a breakthrough decarbonized process to produce the same ordinary portland cement and supplementary cementitious materials used today. These materials have the same quality and performance builders have trusted for decades — now with a positive climate impact.
Show all 36 entries ↓
Investment activity
2011–2022 · 31 investments
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