Brent M. Brindley and M. Sean Sullivan founded Brindley Sullivan in 2004 in downtown St. George. Twenty years in continuous two-partner operation is itself a stability signal in this segment, where many small firms either grow into larger partnerships or split as the founders’ practices diverge. Brindley and Sullivan have done neither.
A specialty division that actually fits the client base
The internal structure is the operational story. Brindley runs the family-law side of the firm — divorce, custody, family-law-adjacent litigation. Sullivan runs the estate-planning side — wills, trusts, probate, asset protection, business succession. That specialty division is unusually clean for a two-attorney firm, and it maps almost exactly to the natural overlap between divorce work and estate work.
Why the overlap matters
When a marriage ends, the estate plan written during the marriage usually has to be redone. Existing trusts need rewriting, beneficiary designations across retirement accounts and life-insurance policies need updating, business-ownership structures may need restructuring, and the new estate plan has to account for ongoing custody and child-support obligations. Most clients in that situation end up working with one firm for the divorce and a different firm for the estate-plan rewrite, with the inevitable coordination cost. Brindley Sullivan handles both inside the same firm — same address on East 100 South, same set of file folders.
Disclosure
The firm’s site and Facebook page are current, both partners are publicly named with credentials, founding year is published, and Utah State Bar verification is straightforward for both attorneys.
Where this lands
A two-attorney St. George firm with a clean specialty division between family law and estate planning — and the ability to handle the natural client overlap between the two practice areas inside one firm — is exactly the kind of small partnership the 435 register can confidently make findable.