Jul 01, 2026 Four Decades, One Standard: Mark Thornburg Named to Forbes’ 2026 Best-In-State Wealth Advisors List

TSG Wealth Management is proud to announce that Mark Thornburg, Managing Director at TSG Wealth Management, has been named to the 2026 Forbes Best-In-State Wealth Advisors list. The recognition is a fitting milestone for an advisor who has spent four decades doing the same thing with remarkable consistency: putting his clients’ interests first and helping them build toward the retirement years they envisioned.

The Forbes Best-In-State Wealth Advisors list, developed in partnership with SHOOK Research, evaluates advisors based on a range of qualitative and quantitative factors including industry experience, compliance history, client retention, and best practices. Investment performance is not a criterion. The 2026 list covers data from the period of June 30, 2024, through June 30, 2025.

“This recognition means a great deal to me, but the real reward has always been watching my clients enjoy the retirement they worked so hard for,” said Mark Thornburg. “I’ve had the privilege of guiding families through every kind of market over the years, and the trust they place in me is something I never take for granted. This honor belongs to them as much as it does to me.”

Mark’s fascination with economics and investing began in his youth, and in 1985 he turned that passion into a career as a registered advisor. In the four decades since, he has weathered every market cycle imaginable, building a practice grounded in patience, discipline, and an unwavering focus on the long term. That experience is precisely what clients value most: an advisor who has seen it all and keeps them steady through the noise.

Throughout his career, Mark has consistently been recognized for his professionalism and dedication, including being named to the Wells Fargo Advisors Financial Network Platinum Council from 2009 through 2021. The Forbes Best-In-State recognition adds a national distinction to a career already marked by a long record of excellence and client loyalty.

“Mark represents the very best of what it means to be a wealth advisor,” said Mark Schulten, Managing Partner at TSG. “Four decades of serving clients with integrity and genuine care is a rare achievement, and his recognition by Forbes is richly deserved. He sets an example for advisors across our entire organization.”

What has always set Mark apart is his ability to combine deep technical knowledge with a genuine, personal connection to the families he serves. His approach is built on relationships that span years and often generations, with the understanding that financial guidance is ultimately about helping people live the lives they want.

“Mark’s career is a testament to the power of consistency and trust,” said Allen Schreiber, Partner at TSG. “He has built something that very few advisors achieve: a practice rooted in decades of loyal relationships and an unwavering commitment to doing right by his clients. We’re honored to have him representing TSG in Long Beach.”

As TSG continues to grow, advisors like Mark embody the founding principle the organization was built on: to put clients’ interests above all else, with a goal of consistently exceeding expectations. His recognition reinforces the standard of service that has come to define the TSG name.

Advisors like Mark are, in many ways, the foundation TSG is built upon. As newer teams and offices join the organization, it is the steady, long-tenured advisors who set the tone, modeling the consistency and client devotion that define the culture. Mark’s career is a living example of that standard, and his recognition is a reminder of the depth of experience that anchors the practice as it continues to expand.

“Mark is exactly the kind of advisor who makes TSG what it is,” said Brian Borst, CEO of TSG. “His four-decade commitment to his clients, his community, and his craft is genuinely inspiring. This Forbes recognition celebrates not just a great year, but a great career, and we couldn’t be prouder to call him part of the TSG family.”

For Mark, the recognition is a meaningful marker along a journey that is far from over. As he often reflects on a career spent helping others retire with confidence, the sentiment is a simple one: it has been a wonderful life, and there is still more good work to do.

To learn more about Mark Thornburg and TSG Wealth Management, visit tsgwm.com/about/mark-thornburg.

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2026 Forbes Best-In-State Wealth Advisors; Awarded April 2026; Data compiled by SHOOK Research LLC based on the time period from 6/30/24 – 6/30/25 (Source: Forbes.com). See full disclosure.

The Platinum Council distinction is held by a select group of Financial Advisors within Wells Fargo Advisors Financial Network as measured by one or more of the following: completion of educational components, business production from the previous year, and professionalism. Additional consideration may have included best practices and team structures.

High Net Worth designates advisors whose account sizes are typically under $10mm, though may have accounts with higher amounts.