TaxMath Desk
Our Team
AI-assisted research, fact checking and writing, with human review from our team.
Articles are bylined TaxMath Desk. Every figure comes from statute or the state engine, with its sources listed on the page; see our methodology, how we rate sources and corrections.
Paul Filsinger
Co-Founder & CEO, Bird Rock Trading
Paul brings three decades of entrepreneurial leadership to Bird Rock Trading. With a proven track record of scaling startups from inception to successful exits, he drives strategic innovation and market expansion.
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Matthew Gurren
Co-Founder & President, Bird Rock Trading
Matt brings 15+ years of technology and business intelligence leadership across high-growth startups. He oversees all operational execution and strategic marketing initiatives.
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Alex Filsinger
Lead Media Buyer, Bird Rock Trading
Alex leads media buying and campaign optimization. With expertise in programmatic advertising, he ensures campaigns deliver measurable results across all digital channels.
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TaxMath is published by Bird Rock Trading LLC. We are not CPAs and nothing here is tax advice. Corrections and feedback: feedback [at] taxmath.org.