About (New)

QSBS Expert was founded by a group of entrepreneurs, investors, accountants and lawyers who came together when trying to navigate a QSBS situation of their own. We quickly realized that the regulations left a lot of open questions and the publicly available information was confusing to sift through…so we thought that others may also benefit from having a “go to” resource for all things QSBS.

Meet Our Team


Brett Calhoun

QSBS Expert / Co-Founder

Brett Calhoun is a licensed CPA/ABV and holds an MBA from the University of Missouri. Mr. Calhoun has experience as an operator with startups, venture capital experience, and experience advising growth to mature companies’ management on financial reporting, tax, and valuation issues.


Zach Posner

Managing Partner & Co-Founder

Zach is a Managing Partner & Co-Founder at The LegalTech Fund (legaltech.com) and is a guest author at QSBS Expert.


Mark Greco

Mark has more than 13 years of experience providing tax and consulting services for clients. He regularly assists clients in the real estate, manufacturing, and distribution industries. His expertise includes providing year-round tax guidance for partnerships and S-corporations and their individual owners, advising clients through 1031 exchanges, Qualified Opportunity Zone Funds, and restructuring transactions. Mark is a member of the American Institute of Certified Public Accountants and the Arkansas Society of Certified Public Accountants. He holds CPA licenses in the State of Arkansas and California. He serves on the board of the Northwest Arkansas Continuum of Care in Fayetteville, Arkansas. He is a 2008 graduate of the University of Southern California with a B.S. degree in accounting and a B.S. in business administration.

Valentine Milner

Valentine Milner is a freelance writer covering various topics in tax, accounting and corporate law.
She has experience in article and blog writing, copywriting, technical writing and marketing communications.

Robert Jackson

Evan Brown

Evan Brown

Evan Brown holds a B.A. in Economics with an A. A. in Spanish and is currently enrolled in Widener-Delaware Law School heading into his 2L year. Mr. Brown focuses his education on QSBS topics including tax, securities, and start-up law.

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This article does not constitute legal or tax advice. Please consult with your legal or tax advisor with respect to your particular circumstance.