# Aaron Patzer

> Aaron Patzer is a seed investor at Vital (San Francisco) backing Software and SaaS. See 13 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [Vital](https://shizune.co/investors/profile/vital-6fc2)
- Location: San Francisco, United States
- Total investments: 13
- Last investment: Mar 2023
- Lead investor: 8%
- Last updated: Aug 2026
- LinkedIn: http://www.linkedin.com/in/apatzer
- X (Twitter): http://twitter.com/apatzer
- Website: https://x.com/apatzer
- Facebook: http://www.facebook.com/apatzer

Aaron Patzer is a seed investor at Vital in San Francisco focused on Software and SaaS. In January, I started another company, Vital Software, with Dr. Justin Schrager of Emory University. Vital makes software for hospital emergency rooms. This includes a mobile patient check-in for patients, and the fastest, most usable electronic medical records you've seen for doctors and nurses. We use extensive machine learning and naturallanguage processing to determine patient severity and anticipated actions. Our longer term goal is to cut ER wait times in half, as they are often 4-5 hours long. You might not know it, but there are 140M ER visits in the US alone each year.Medical / sales are in the US, while development is all in Auckland New Zealand. My long-time partner Rebecca, an architect, is a Kiwi and I am now a resident of New Zealand as well.

## Round sizes

| Stage | Round size |
| --- | --- |
| Seed | $150k–$6.1M |
| Pre-Seed | $500k–$1M |
| Series A | $2M–$4M |

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Software | 4 | 31% |
| SaaS | 3 | 23% |
| Health Care | 3 | 23% |
| Enterprise Software | 3 | 23% |
| Artificial Intelligence | 3 | 23% |

44 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Seed | 7 | 54% |
| Pre-Seed | 2 | 15% |
| Series A | 2 | 15% |
| Series B | 1 | 8% |

### Country

| Country | Investments | Share |
| --- | --- | --- |
| United States | 9 | 69% |
| Estonia | 1 | 8% |
| New Zealand | 1 | 8% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Vital | Keep patients more informed and engaged in the emergency room, hospital, and beyond. Vital’s AI-powered patient experience solutions give patients control, clarity, and predictability when they need it most. | $24.7M | Series B | Mar 23, 2023 |  |
| Shen.AI | Shen.AI turns any camera into a clinical-grade health monitor. Our AI SDK captures multimodal biosignals from a 30-second face scan and returns 30+ vital signs and risk indices (e.g., BP, HR, HRV, breathing rate, BMI), on-device, no hardware or cloud required. We ship a plug-and-play SDK that integrates in a day across mobile, web, and IoT;wellness today. Customers use us for virtual triage, remote monitoring, chronic care, and engagement. | $520K | Pre-Seed | Oct 30, 2020 |  |
| Carbon Health | Carbon Health is a tech-enabled healthcare company that delivers virtual care experience. It offers primary care services through a mobile application that enables users to follow-up on a treatment plan, manage prescriptions, and see lab reports all through one app. Carbon Health has created a coronavirus assessment tool and also set up covid-19testing in California.The company was founded in 2015 and is headquartered in San Francisco, California. | $4.2M | Seed | Mar 30, 2017 |  |
| Vital | Keep patients more informed and engaged in the emergency room, hospital, and beyond. Vital’s AI-powered patient experience solutions give patients control, clarity, and predictability when they need it most. | $1M | Pre-Seed | Feb 20, 2017 |  |
| Honest Dollar | A new stealth startup founded by some of the most innovative individuals in the technology and Financial Services industries. What are we doing? Well it wouldn't be much of a stealth startup if we told you that in the "Company Description. | $3M | Seed | Oct 02, 2015 |  |
| Gusto | Gusto develops web-based payroll solution for small- and medium-sized businesses. It operates an online platform that provides payroll, benefits, human resources, and integration services for employers and employees in the United States.Gusto offers health benefits and workers’ compensation benefits that include medical insurance, commuterbenefits, and 401(k) contributions as well as workers’ compensation insurance plans, time tracking, and integration services, and access to employees for processing payroll from web-enabled devices such as smartphones and tablets. It also provides access to employees and contractors to browse their previous pay stubs, review their payroll forms, verify their personal details, and statistics about their pay, tax payments and federal forms filing services, and security and support services.Gusto serves startups, coffee shops, doctors, creative agencies, lawyers, and boutiques. Edward Kim, Joshua Reeves, and Tomer London founded ZenPayRoll in 2011 that became Gusto, with its headquarters in San Francisco in California with an additional office in Denver in Colorado. | $6.1M | Seed | Dec 11, 2012 |  |
| DoubleDutch | DoubleDutch develops event management software for the events industry worldwide. It provides live engagement platform that includes applications, integrations, and performance metrics which, allows orchestrating live events; and online event registration solution that enables to create custom event registration pages, collect registrantinformation and payments online, manage pre-event activity and correspondence, and optimize registrant data. DoubleDutch offers solutions for external events, internal meetings, and associations. It serves customers ranging from brands to local association for their external and internal corporate meetings, tradeshows and expos, associations, and conferences. Lawrence Coburn and Pankaj Prasad founded DoubleDutch in 2010, with its headquarters in San Francisco in California and additional offices in Phoenix in Arizona and Amsterdam in the Netherlands. It operates as a subsidiary of Cvent as of June 10, 2019. | $2M | Series A | Apr 23, 2012 |  |
| Prism Skylabs | Prism is a cloud-based video intelligence platform that transforms ordinary cameras into powerful business tools. Through computer vision, A.I., and machine learning, Prism unlocks valuable information from video that can be immediately understood, shared and acted upon. Leading companies in 80 countries around the world use Prism to betterunderstand, manage and grow their business | $1.5M | Seed | Sep 01, 2011 |  |
| BizeeBee | Membership management made easy.With BizeeBee owners and staff of offline membership based businesses can track attendance and revenue, sell services and take payments thereby increasing renewals and retaining members.Businesses such as yoga, dance, martial arts, and fitness studios as well those who teach performing arts and continuingeducation classes have benefited and grown their business using BizeeBee. | $435K | Seed | Apr 28, 2011 |  |
| HealthTap | HealthTap is a virtual-first, affordable urgent and primary care clinic, providing top-quality physician care equitably nationwide to all Americans, with or without insurance. | $2.4M | Seed | Mar 23, 2011 |  |

10 of 13 investments shown.

## Co-investors
- [SMOK Ventures](https://shizune.co/investors/profile/smok-ventures) — VC Fund, 2 deals together
- [SV Angel](https://shizune.co/investors/profile/sv-angel) — VC Fund, 2 deals together
- [The Perkins Fund](https://shizune.co/investors/profile/the-perkins-fund) — VC Fund, 2 deals together
- [137 Ventures](https://shizune.co/investors/profile/137-ventures) — VC Fund, 1 deal together
- [Aslanoba Capital](https://shizune.co/investors/profile/aslanoba-capital) — VC Fund, 1 deal together
- [Aspect Ventures](https://shizune.co/investors/profile/aspect-ventures) — VC Fund, 1 deal together

## About Vital

VC Fund · Auckland, New Zealand

Keep patients more informed and engaged in the emergency room, hospital, and beyond. Vital’s AI-powered patient experience solutions give patients control, clarity, and predictability when they need it most.

5 contacts available at Vital.

| Name | Title | Profile |
| --- | --- | --- |
| Aaron Patzer | Founder & CEO | https://shizune.co/investors/profile/aaron-patzer |
| Felix Brann | Head of Data Science | https://shizune.co/investors/profile/felix-brann |
| Justin Schrager | Founder & CMO | https://shizune.co/investors/profile/justin-schrager |
| Kurt Essenmacher | VP of Operations & Sales | https://shizune.co/investors/profile/kurt-essenmacher |
| Nate Fletcher | Director of Operations | https://shizune.co/investors/profile/nate-fletcher |

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## FAQ

### What does Aaron Patzer invest in?

Aaron Patzer invests primarily in Software, SaaS and Health Care startups, most often at Seed and Pre-Seed stage. Most of the 13 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### What is Aaron Patzer's check size?

Aaron Patzer typically joins rounds of $150k–$6.1M at Seed, $500k–$1M at Pre-Seed and $2M–$4M at Series A. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds Aaron Patzer participates in.

### When did Aaron Patzer last invest?

The most recent investment recorded for Aaron Patzer closed in Mar 2023. Shizune tracks 13 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.

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