About Mark Christiansen Associates LLC

Who We Are—

Aurora’s Longstanding Tax & Accounting Firm

Proudly serving the Aurora community since 1986, Mark Christiansen Associates LLC combines decades of local experience with a full range of tax, accounting, and business consulting services.

Built for Aurora—Decades of Local Service

Mark Christiansen Associates LLC was founded in 1986 to provide Aurora and neighboring communities with clear, reliable tax and accounting support. Many firms offer tax preparation, but few match our longevity or commitment to serving both individuals and businesses at every stage. Our team’s background includes public accounting leadership and faculty experience at Aurora Community College, bringing insight into both client needs and the local landscape. Today, our office on South Parker Road remains a steady, welcoming presence for clients who value partnership, stability, and approachable service.

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Our mission is to give every client—from families to local businesses—the clarity, confidence, and guidance they need to move forward with financial decisions.

Values That Shape How We Show Up for You

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Integrity
Every recommendation is rooted in honesty, transparency, and your long-term interests—so you always know where you stand.

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Service
We take pride in responsive communication, simple processes, and clear answers for all clients, whether you’re new or have worked with us for decades.

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Community
With deep roots in Aurora, we believe in supporting the people, nonprofits, and small businesses that make our area unique.

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Professional Membership
As active members of the National Society of Accountants, we maintain high standards for compliance and continual learning, so you get the most current guidance.

Proudly Rooted in the Aurora Community

We serve individuals, families, business owners, and nonprofits across Aurora, Denver, Centennial, and Colorado Springs. Our office is located at 2851 S Parker Rd, Suite 1200, Aurora, CO 80014, and we’re always available by phone or in person for support that goes beyond tax season. Many clients appreciate our long-standing presence, trusted local connections, and the sense of stability that comes with working with a truly established Aurora accounting firm. Whether you need tax planning, bookkeeping, IRS support, or business consulting, our team is ready to help.

Next Steps

Make One Decision Today That Reduces Months of Stress

Choosing a firm with a proven record means less worry now and more confidence when deadlines approach. Mark Christiansen Associates LLC has served the region for decades, building trust with individuals and businesses who need answers, not runaround. Let’s talk about your goals and make your financial decisions simpler from the very first conversation.