# Old Mountain

Old Mountain is a Single Family Office based in Boston, United States.

## Overview

- **Organization type:** Single Family Office
- **Headquarters:** Boston, United States
- **Region:** North America
- **Address:** Boston, MA, United States
- **Assets under management:** $1B (Altss estimate)
- **Website:** https://oldmountain.net
- **LinkedIn:** https://www.linkedin.com/company/old-mountain

## Regulatory record

- **Reports private funds:** No

## About

Marshall Field V established Old Mountain as the primary vehicle for managing family capital. The office traces its wealth origin to the Chicago-based Marshall Field retail fortune. Jane Mendillo, a family member and former CEO of Harvard Management Company, serves as Senior Investment Advisor and Trustee. Old Mountain deploys capital through direct co-investments, SPVs, private equity, private credit, real estate, infrastructure, and natural resources. It covers early-stage and middle-market opportunities across FinTech, Enterprise Software, AI/ML, and Cybersecurity. Confirmed geographic reach includes North America, Europe, Asia, South America, and Africa. John Pirovano, President and brother-in-law to Marshall Field V, oversees operations alongside Daniel Mosley, President of the affiliated Old Mountain Private Trust Company. The firm reports an estimated $1B under management. It maintains no disclosed additional offices beyond Boston. Marshall Field V holds board roles at the World Wildlife Fund and Atlantic Salmon Federation. Philanthropic vehicles include the Everglades Foundation and Field Foundation of Illinois. No operational events from the last 24 months appear in available records. Old Mountain operates through a hybrid structure that combines direct investment authority with a dedicated private trust company. This setup separates investment execution from trust administration while keeping both under family control via Marshall Field V and his designated partners.

## Sectors

- FinTech
- Media & Entertainment
- ClimateTech
- Industrial Tech
- InsurTech
- Energy Transition & Renewables
- Healthcare Services
- Mobility & Transportation
- Sports & Wellness

## People

- Marshall Field V — Founder
- John Pirovano — President
- Jane Mendillo — Senior Investment Advisor and Trustee
- Daniel Mosley — President and Director of Old Mountain Private Trust Company

## Questions

### Who runs investment decisions at Old Mountain?

Marshall Field V serves as founder and primary principal. Jane Mendillo acts as Senior Investment Advisor and Trustee. John Pirovano holds the role of President.

### How does Old Mountain source proprietary deal flow?

The firm evaluates direct investments and maintains strategic partnerships with experienced managers and operators. It covers early-stage and middle-market opportunities across multiple sectors.

### Is Old Mountain structured as a single family office or does it operate more like a venture firm?

Old Mountain functions as a single-family office. It also maintains the affiliated Old Mountain Private Trust Company for trust administration.

### Does Old Mountain participate in fund commitments or only direct deals?

The firm uses direct co-investments and SPVs alongside fund-of-funds commitments, private equity, and other structures.

## Related profiles

- [Olbia Investments](https://altss.com/profile/olbia-investments-salteri-family-office)
- [RWN Management](https://altss.com/profile/rwn-management-marc-rowan-family-office)

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Last updated: 2026-08-10T15:54:10.904Z

Canonical page: https://altss.com/profile/old-mountain

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