Who We Are

Our Story

TYS is the story of three accounting professionals.  Each spent 20 years in the industry seeking a “better way” to conduct business.   They knew accounting could be a dynamic, proactive tool that helped companies grow and thrive.   However, they found it difficult to implement change within traditional CPA-firm environments.

As a result, Glen Thomas, Chris York and Tim Shortsleeve formed a new kind of accounting firm in 2010.  TYS is collaborative, innovative, and on the leading edge.   TYS clients benefit from its forward thinking, efficient processes and smart use of technology. All of this is backed by rock-solid knowledge and experience – and some really great people.

Values Matter

At TYS our employees bring our values to life everyday. In them you will find integrity, initiative, and high standards for performance.  Here are some of the key ideas that drive our values:

  • Empowered employees make better decisions for their clients.
  • Numbers are important, but only because of the people behind them.
  • Results are impressive. Not billable hours, or the amount of time spent at your desk.
  • The words  “fun” and “accounting” can be found in the same sentence.
  • Change is a constant. Learn to love it.


Our Team


Glen A. Thomas Glen A. Thomas CPA Less More

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“Innovative” and “CPA” may not seem like concepts that belong together. But, clients that work with Glen understand how powerful the combination can be.

Today, as a founder and a partner at TYS, Glen applies his collaborative and “what if” style of accounting to organizations of all sizes.  He helps guide businesses through acquisitions, successions, and other transitions – while ensuring that the goals and needs of everyone are satisfied.

Glen launched into the world of accounting with his degree from California State University, Chico, in 1983. Upon graduation, he joined Jones & Marzluft (J&M) in Danville, California. In May 1986, he opened the Orange County office of Jones, Henle & Schunck (JHS) as a manager and accrued in-depth construction industry knowledge and network. Glen became licensed in 1987.

Glen left JHS in 1988 to become CFO of Tracy Industries (Tracy), a group of site development contractors and residential land developers.  In March 1991 Glen rejoined JHS in Danville. 
Glen became an owner with JHS and in 2005, its CEO.

In October 2007, Glen embarked on a lifelong dream with Chris York (formerly of JHS), to form ThomasYork, LLP. The addition of Tim Shortsleeve formed an exciting new triumvirate — and a new company:  TYS.

Glen satisfies his passion for education as a committee member of the CalCPA Society Accounting Education Committee. He is also a member of the Business Advisory Board at the School of Business at California State University, Chico.



Christopher D. York Christopher D. York CPA Less More

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According to Chris, there’s always more than one way to solve a problem. Chris provides clients with accounting guidance that includes candid feedback and multiple perspectives. His 20+ years of accounting experience, and his robust construction market credentials, help clients proactively meet their compliance issues and make sound business decisions.

Chris earned his accounting degree in 1990 from California State University Sacramento. He joined Jones, Henle & Schunck where he worked for 17 years and became a shareholder. There he built considerable insight and experience into the construction industry, and other large and small businesses.

Now a founder at TYS, Chris continues to offer clients a fresh perspective on their businesses, and practical, actionable advice that can make a difference.

Chris is a past president of the Surety Association of Northern California, a member of American Institute of Certified Public Accountants, the California Society of Certified Public Accountants, and is active in the Construction Financial Management Association.

Tim Shortsleeve Tim Shortsleeve CPA.CITP Less More

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“Focus, environment, results.”  Tim Shortsleeve creates high performing organizations with these three words.  Having worked with a diverse range of clients, Tim knows that audit, tax, and planning issues are the easy parts.   Tim digs deep to understand his clients and guide them through the process of building a more efficient, healthy organization.  It’s a collaborative process that yields results, trust, and positive momentum.

Tim graduated from the State University of New York at Oswego in 1984, and spent the first decade of his career in the Rochester, NY offices of Price Waterhouse and a Rochester regional accounting firm.  In 1994 he became a partner with the firm Bonn, Shortsleeve & Co., and over the course of 15 years provided tax, audit, accounting and process improvement services to closely held businesses in the areas of manufacturing, construction, not-for-profit, retailing, health care, and high-tech service industries.

Tim left the firm in 2010 and joined TYS as a  partner in the Rochester office . Today he uses his in-depth accounting and business process knowledge to help clients focus and achieve alignment in order to reach their goals.

Tim speaks frequently across the country on various tax, sales and business efficiency topics, and he’s written articles for numerous publications. Tim was selected to the Rochester Business Journal class of 2000 “40 Under 40” up and coming business professionals. Tim is also the past-president of the Rochester Chapter of the Epilepsy Foundation and was a former hockey coach at the Rochester Institute of Technology and also Monroe Community College.

Tobin G. Moon Tobin G. Moon CPA Less More

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Need something done right? Ask a busy man.

Tobin is that man. As a manager at TYS and father to two sets of
twins, Tobin knows that focus, dedication and enthusiasm are key
to success. (Of course, a full night’s sleep is also helpful.)

Tobin earned his degree from the University of Northern Colorado
in 1999, and became licensed as a CPA in 2008. He quickly
gained experience working for a small Colorado-based CPA firm
and a construction-focused accounting firm in California.

Tobin joined TYS eager to be part of a more non-traditional
accounting firm where he could focus on generating results for his
clients – not just billable hours.

The results-only work environment (ROWE) at TYS means Tobin
can partner with his clients to do more than just solve problems or
avoid accounting pitfalls. He proactively explores opportunities
for growth, cost efficiencies, and process improvement.

In between his duties as a partner and a dad, Tobin pursues golf
as his backup career. He is also becoming somewhat of a health
fanatic, while maintaining his self-proclaimed status as a cookie


Melissa A. Doty Melissa A. Doty Tax Manager CPA Email
Melissa D. Wallace Melissa D. Wallace Tax Manager CPA EmailImport to Address Book


Christel J. Whetstone Christel J. Whetstone Senior Accountant CPA EmailImport to Address Book
Sapan Chokshi Sapan Chokshi Senior Accountant EmailImport to Address Book
Christy Jenny Christy Jenny Staff Accountant CPA EmailImport to Address Book
Marcia Adams Marcia Adams Staff Accountant Email
Emily Ball Emily Ball Staff Accountant Email
Dan Beyer Dan Beyer Staff Accountant CPA Email
Lance Cleveland Lance Cleveland Staff Accountant Email
Brett Hearthorn Brett Hearthorn Staff Accountant Email
Alex Perez Alex Perez Staff Accountant Email


Ann M. Aman Ann M. Aman Administrative Supervisor, NY EmailImport to Address Book
Kris Trathen Kris Trathen Administrative Assistant, CA Email