Staff Profiles


David Simpson is a certified public accountant who has specialized in financial and tax planning for more than 35 years – always in the public accounting sector. David’s certifications and affiliations are numerous; beginning with his Bachelor of Science – Accounting emphasis from the University of Southern California, he has been a Certified Public Accountant in the state of California since 1983, a member of the American Institute of Certified Public Accountants (AICPA) and California Society of Certified Public accountants.

Owning his own Certified Public Accounting firm since 1986 was the natural progression for David after having spent six years with the “Big Eight” firm of Touche Ross (now known as Deloitte.) in both the auditing and tax departments. During those years David pursued a graduate degree Masters in Business Taxation from the University of Southern California which was completed in 1987.

Since owning his own firm, David has enjoyed the challenge of the field of taxation and directed the firm to specialize in business and individual tax planning and preparation. Whereas the firm also provides services in the areas of accounting and accounting software consulting the main emphasis has been in tax planning and preparation.

Outside of the office, David has pursued an interest in ice hockey into actually playing “fun” level hockey, coaching his daughter’s sports teams, traveling as much as time will permit and spending time with his family.

SHAY LEIMBACH | Accounting Manager

YSABEL GARCIA | Accountant

Ysabel joined the Simpson & Co. staff in 2015. She was originally hired as an administrative assistant while attending college. In 2018, she graduated from California State University, Fullerton and earned her Bachelor’s Degree in Accounting. Since graduating Ysabel has been promoted to staff accountant and has significantly increased her responsibilities in the office. She currently provides various accounting services for her business clients, both on-site and remotely. Her responsibilities currently include financial statement preparation, bank account reconciliation, and period ending adjusting journal entries. In addition to her accounting duties, Ysabel corresponds with taxing authorities as needed and is involved in the preparation of individual, sales, payroll, and property tax returns. She currently has plans on attending California State University, Fullerton to earn her Master’s Degree in taxation.

In her free time Ysabel enjoys traveling, taking pictures, going to concerts, and occasionally binge watching TV shows. Her favorite TV show is HBO’s Game of Thrones.

ANNIE DIPILLO | Administrative Assistant

If you have contacted Simpson and Company you may have already met Annie. Annie DiPillo is the most recent addition to the company starting in 2018 as an administrative assistant. Her duties consist of communicating with all of our clients which includes setting up appointments, answering questions, providing documents, etc. In addition, she is responsible for the final assembly and processing of both tax returns and financial statements prepared by the firm. Along with the accounting experience she gains while working for Simpson and Co., she is also pursuing a Bachelor’s Degree in Business with an emphasis in Accounting.

Outside of work and school, she enjoys being on the water. Summer is her favorite season, as she travels to Arizona and enjoys the river and lakes with her family and friends. Along with going to the beach, kayaking and hiking. Another hobby she enjoys is CrossFit. Growing up as an athlete it is only natural that she loves a little bit of competitiveness.