Chief Executive Officer - CPA, FCA, CCA
In 2002, Caroline Tanell laid the groundwork for what would become Mesa CPA Group. Caroline is a certified public accountant and has taught at The University of Arizona in the past.
She is a member of the Tax Section of the American Institute of Certified Public Accountants and the Arizona Society of Certified Public Accountants.
Head of Accounts - CPA, ABA
Monica joined the Mesa CPA Group in 2004, a few years after graduating in Accounting. Her previous degree and expertise in public relations was fundamental for the growth of the Mesa CPA Group.
Monica became Head of Accounts in 2009, with responsibility for managing the daily affairs of a portfolio of business customers.
Head of Bookkeeping - CPA, CMA
Ana Williams has more than twenty-five years of experience working as an accountant in a variety of settings, including corporate environments and national accounting firms.
Ana attended the University of Arizona, where she received her Bachelor of Business Administration in Accounting degree, and Worcester Polytechnic Institute, where she received her Master of Business Administration degree.
Valuation Analyst - CPA, CVA
Nelson Hills, a Certified Public Accountant and a Certified Valuation Analyst joined the company in 2010, having previously held positions at Cornwell Jackson in Dallas and FedEx in Memphis.
Nelson is a graduate of Arizona State University, where he earned his bachelor's degree, and he also has a master's degree in business administration. He is also a member of the AICPA's Forensic and Valuation Section, where he oversees internal valuation audits.
Assistant
Elena is the person who helps our company maintain order and open communication. She’s currently studying to become an accountant, and she hopes to continue adding value to our firm from a different position.
Elena is usually the main bridge between our clients and our specialists, making her an essential part of our company.
Audit Specialist - CPA, CIA
The most recent member of the team to join is Theodore Russell, who started working for Mesa CPA Group in October 2020. He has more than twenty years of experience in the accounting field and graduated from Franklin University as the first of his class.
Theodore takes great pleasure in assisting others in launching new businesses, and he is typically the first to clear some time in his schedule for consultations.
Mesa CPA Group was built on the belief that financial clarity is the foundation of every successful business. Too many entrepreneurs start with passion but lack the financial infrastructure that turns great ideas into thriving enterprises.
We entered this space because we saw a gap: small businesses were either underserved by large accounting firms who didn't prioritize them, or overpaying for generic services that weren't tailored to their specific industry or growth stage.
Our approach is different. Every client works directly with a certified accountant who takes the time to understand your business inside and out — your revenue model, your cost structure, your competitive landscape, your goals. We don't hand you off to a junior associate after onboarding.
Whether you're forming a new LLC, scaling from 5 to 50 employees, or preparing for your first audit, we bring the same depth of expertise and personal attention that was previously only available to large corporations. That's the Mesa CPA Group difference.
In accounting, details matter enormously. We approach every engagement with meticulous attention to accuracy — in your books, in your filings, in our advice.
We're not just a vendor. We invest in understanding your business goals and act as a true financial partner — proactive, not reactive.
No jargon, no hidden fees, no surprises. We believe you should always understand your own financial picture and the work we're doing for you.
Our services are designed to scale with your ambitions. We plan not just for where you are today, but for where you're going.
Business moves fast. We're here when you need us — not just at tax season — with timely answers and proactive insights when timing matters.
We handle your most sensitive financial information with complete confidentiality and unwavering ethical standards. Always.