Rooted in Tyler

A legacy that lasts

At Prothro, Wilhelmi & Company, our work is grounded in something deeper than just numbers. What began as a solo venture by Thomas G. Prothro in 1992 has grown into a trusted, multi-partner firm serving individuals and businesses across Tyler and East Texas with clarity, care, and principled guidance.

As our mission statement says:

“We believe that by possessing ethical and eternal values, an individual or business has infinite potential to succeed.”

A foundation of
faithfulness

Though our team and services have expanded, our foundation remains unchanged: personalized service, long-term relationships, and a commitment to our values.

We hold Matthew 6:33 close to our mission: “But seek first the kingdom of God and his righteousness, and all these things will be added to you.”

What our clients say

“The team at Prothro, Wilhelmi has been instrumental in helping our business grow with integrity. Their values-driven approach gives us confidence in every decision.”

Sarah Mitchell

Small Business Owner

“Working with a firm that puts faith and ethics first has been transformative. They truly care about our long-term success, not just the bottom line.”

David Thompson

Family Trust Manager