# William Rosenzweig > William Rosenzweig is a Series A investor at altMBA backing Software and Water. See 5 investments, check sizes, portfolio and contact details. Updated Aug 2026. - Type: Angel Investor - Fund: altMBA - Total investments: 5 - Last investment: Apr 2015 - Lead investor: 20% - Last updated: Aug 2026 - LinkedIn: https://www.linkedin.com/in/william-rosenzweig - X (Twitter): http://twitter.com/ideagardener William Rosenzweig is a Series A investor at altMBA focused on Software and Water. William Rosenzweig - Chairperson @ The Teaching Kitchen Collaborative ## Contacts 5 contacts available for William Rosenzweig: work email, personal email, work phone, personal phone and socials. Sign up free to unlock them: https://app.shizune.co/sign-up/investor-profiles/find-email/william-rosenzweig?utm_source=investor_profile ## Investment focus ### Industry | Industry | Investments | Share | | --- | --- | --- | | Software | 2 | 40% | | Water | 1 | 20% | | GovTech | 1 | 20% | | E-Commerce | 1 | 20% | | Electronics | 1 | 20% | 7 industries tracked in total. ### Stage | Stage | Investments | Share | | --- | --- | --- | | Series A | 1 | 20% | | Series B | 1 | 20% | | Series C | 1 | 20% | | Series D | 1 | 20% | | Series E | 1 | 20% | ## Investments | Company | Description | Amount | Stage | Date | Website | | --- | --- | --- | --- | --- | --- | | WaterSmart Software | WaterSmart Software provides intelligence beyond the meter to make the lives of water utility managers easier. Water providers using WaterSmart’s cloud-based, customer engagement, and analytics platform have been proven to reduce costs, protect revenue, and increase customer satisfaction by more than 25%. The company has won the globally covetedWorld Economic Forum Technology Pioneers Award for their potential to impact business and society through the design, development, and implementation of new technologies and innovation. | $7M | Series B | Apr 07, 2015 | | | Gazelle | Gazelle is an e-commerce platform for buying and selling used electronic gadgets. They pay cash for used smartphones, tablets, laptops, and desktops and then inspect, certify them, and sell them to consumers looking for a cost-effective way to stay connected. The company was founded in 2006 and is headquartered in Boston, Massachusetts withoperations in Louisville, Kentucky. | $9.5M | Series E | Aug 11, 2014 | | | WaterSmart Software | WaterSmart Software provides intelligence beyond the meter to make the lives of water utility managers easier. Water providers using WaterSmart’s cloud-based, customer engagement, and analytics platform have been proven to reduce costs, protect revenue, and increase customer satisfaction by more than 25%. The company has won the globally covetedWorld Economic Forum Technology Pioneers Award for their potential to impact business and society through the design, development, and implementation of new technologies and innovation. | $4.5M | Series A | Aug 27, 2013 | | | Gazelle | Gazelle is an e-commerce platform for buying and selling used electronic gadgets. They pay cash for used smartphones, tablets, laptops, and desktops and then inspect, certify them, and sell them to consumers looking for a cost-effective way to stay connected. The company was founded in 2006 and is headquartered in Boston, Massachusetts withoperations in Louisville, Kentucky. | $22M | Series D | Jul 21, 2011 | | | Gazelle | Gazelle is an e-commerce platform for buying and selling used electronic gadgets. They pay cash for used smartphones, tablets, laptops, and desktops and then inspect, certify them, and sell them to consumers looking for a cost-effective way to stay connected. The company was founded in 2006 and is headquartered in Boston, Massachusetts withoperations in Louisville, Kentucky. | $12M | Series C | Jul 21, 2010 | | 5 of 5 investments shown. ## Co-investors - Apsara Capital — VC Fund, 2 deals together - [RockPort Capital](https://shizune.co/investors/profile/rockport-capital-partners) — VC Fund, 2 deals together - [The Westly Group](https://shizune.co/investors/profile/the-westly-group) — VC Fund, 2 deals together - [Threshold](https://shizune.co/investors/profile/threshold) — VC Fund, 1 deal together - [Unilever Ventures](https://shizune.co/investors/profile/unilever-ventures) — VC Fund, 1 deal together - [Venrock](https://shizune.co/investors/profile/venrock) — VC Fund, 1 deal together ## About altMBA VC Fund 1 contacts available at altMBA. | Name | Title | Profile | | --- | --- | --- | | William Rosenzweig | Course Leader and Co-Founder: The Business of Food Workshop | — | ## Similar investors ### Similar stage - [Antler](https://shizune.co/investors/profile/antler-be9c) — VC Fund - [Alumni Ventures](https://shizune.co/investors/profile/alumni-ventures-group) — VC Fund - [General Catalyst](https://shizune.co/investors/profile/general-catalyst-partners) — VC Fund ## FAQ ### What does William Rosenzweig invest in? William Rosenzweig invests primarily in Software, Water and GovTech startups, most often at Series A and Series B stage. Most of the 5 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio. ### How do I contact William Rosenzweig? Public channels for William Rosenzweig include LinkedIn and X (Twitter). For a verified work email and phone number, create a free Shizune account — contact data is searched across 20+ sources and validated before delivery, so your outreach lands in the right inbox. ### When did William Rosenzweig last invest? The most recent investment recorded for William Rosenzweig closed in Apr 2015. Shizune tracks 5 investments in total for this profile, including round sizes, stages and portfolio companies, all sourced from confirmed public funding rounds and refreshed monthly. ### Is Shizune's investor data accurate? Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Aug 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page. # About Shizune Shizune.co is an investor database. Core features: - 48,091 startup investors (angels, VCs, accelerators, and others) - Email, phone, LinkedIn (for intros), socials, and other contact data - Updated daily from public funding news - CSV and Excel export The User can access the full database FOR FREE after signing up: shizune.co