# Diesslin Group

Diesslin Group is a Multi Family Office based in Fort Worth, United States.

## Overview

- **Organization type:** Multi Family Office
- **Headquarters:** Fort Worth, United States
- **Region:** North America
- **Address:** Fort Worth, TX, United States
- **Founded:** 1980
- **Assets under management:** 621 (Altss estimate)
- **Website:** diesslin.com
- **LinkedIn:** https://www.linkedin.com/company/diesslin/

## Regulatory record

- **CRD number:** 110557
- **SEC file number:** 801-31827
- **Registration status:** APPROVED
- **Latest Form ADV filing:** 2026-03-04T06:00:00.000Z
- **Reports private funds:** Yes
- **Private funds reported:** 0
- **IAPD record:** https://adviserinfo.sec.gov/firm/summary/110557

## About

David H. Diesslin established Diesslin Group in 1980. The firm began as a fee-only financial planning practice and expanded into multi-family office services for high-net-worth clients, estates, and foundations. Services center on investment management, estate and legacy planning, tax strategies, retirement planning, insurance, and charitable giving. The firm operates without product commissions and maintains a team-based approach to portfolio construction and ongoing monitoring. No specific portfolio holdings or co-investors appear in public materials. The firm lists twelve professionals on its site, including Chief Investment Officer Mark M. Michel and several client relationship managers. It maintains its sole office in Fort Worth. David H. Diesslin previously served as chairman of the CFP Board of Standards and as a founding member and past president of NAPFA. Governance remains tied to the founding principal and a small group of senior advisors who also hold operational roles in the firm.

## People

- David H. Diesslin — Founder
- Norman R. (Rocky) Farr — Principal, Managing Director, and Relationship Manager
- Shawn L. Gray — Principal, Vice President, and Chief Financial Officer
- Mark M. Michel — Chief Investment Officer and Portfolio Manager

## Questions

### Who runs investment decisions at Diesslin Group?

Mark M. Michel serves as Chief Investment Officer and Portfolio Manager. Luke Hockett also acts as Portfolio Manager. Investment oversight occurs within the firm's fiduciary, fee-only framework.

### Does Diesslin Group participate in fund commitments or only direct deals?

Public materials do not disclose specific fund commitments or direct investments. The firm describes its work as investment management and portfolio optimization without naming external managers or holdings.

## Related profiles

- [Stenger Family Office](https://altss.com/profile/stenger-family-office-llc)
- [Stone Temple Partners](https://altss.com/profile/stone-temple-partners)

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Last updated: 2026-06-03T20:00:00.000Z

Canonical page: https://altss.com/profile/diesslin-group

Maintained by Altss — https://altss.com — methodology: https://altss.com/methodology