# MCJ

MCJ is a Private Equity based in Boston, United States.

## Overview

- **Organization type:** Private Equity
- **Headquarters:** Boston, United States
- **Region:** North America
- **Address:** Boston, MA, United States
- **Founded:** 2019
- **Assets under management:** Undisclosed
- **Website:** mcj.vc
- **LinkedIn:** https://www.linkedin.com/company/mcjvc

## Regulatory record

- **CRD number:** 310067
- **Registration status:** Registered
- **Reports private funds:** No
- **IAPD record:** https://adviserinfo.sec.gov/firm/summary/310067

## About

MCJ is a venture capital firm backing founders driving the transition of energy and industry and solving the inevitable impacts of climate change. They back founders rewriting industries for the future. The firm grew out of the My Climate Journey podcast started by Jason Jacobs.

## Sectors

- Energy Transition & Renewables
- ClimateTech
- AI/ML
- Nuclear
- Mobility & Transportation
- AgriTech & FoodTech

## People

- Cody Simms — Managing Partner
- David Aronoff — Chairman and Managing Partner
- Yin Lu — Partner
- Thai Nguyen — Partner
- Jason Jacobs — Founder and Venture Partner

## Questions

### Who runs investment decisions at MCJ?

Cody Simms and David Aronoff serve as Managing Partners, with Yin Lu and Thai Nguyen as Partners driving deal execution and sector coverage. Jason Jacobs, who founded the firm and launched the My Climate Journey podcast, is listed as Founder and Venture Partner. The partnership evaluates deals collectively, drawing on the firm's operator network for technical diligence.

### How does MCJ source proprietary deal flow?

MCJ sources via its podcast and newsletter ecosystem, which functions as a sustained demand-generation channel. The 'My Climate Journey' podcast brings climate-tech founders and technical experts to the audience, and many portfolio companies enter the pipeline through these media relationships. The talent platform adds a second on-ramp — portfolio companies often interact with MCJ first through hiring before formal fundraising conversations begin.

### What investment stages does MCJ typically target?

MCJ targets early-stage companies, primarily seed and Series A rounds. Its portfolio spans pre-revenue deep-tech startups such as Standard Nuclear and Pacific Fusion, alongside companies with initial commercial traction like Pravah (grid scheduling software in active utility trials). The firm stated a 'Start-up' and 'Seed' focus across its Altss research classification.

### Which sectors does MCJ explicitly avoid?

The firm does not publish an explicit exclusion list, but its portfolio reveals a clear avoidance of generalist consumer internet, enterprise SaaS without climate relevance, adtech, and traditional fintech. Investment activity concentrates entirely on energy, industrial decarbonization, advanced computing infrastructure for climate applications, and the broader climate-transition stack.

### How is MCJ related to the My Climate Journey podcast?

MCJ and the My Climate Journey podcast share a founder in Jason Jacobs and operate under the same umbrella. The podcast predates the formal investment entity and now functions as a core sourcing and brand-building asset. Jacobs, currently Venture Partner, hosts the podcast, which has recorded hundreds of episodes with founders, scientists, and policy leaders in climate.

## Related profiles

- [MC Investments](https://altss.com/profile/mc-investments)
- [McKee Foods Retirement Plan](https://altss.com/profile/mckee-foods-retirement-plan)

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Last updated: 2026-08-11T15:07:26.757Z

Canonical page: https://altss.com/profile/mcj

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