About Us

First and foremost, we are TAX SPECIALISTS. We have decades of experience planning and preparing tax returns. We also have helped hundreds of clients through difficult tax issues and tax problems including filing past tax returns.

The central coast is our home and our community. Through years of consistent service we have built a reputation of trust with our clients. You can feel comfortable here.

Our services range from personal to corporate taxes. We also handle estate and gift tax issues.

Corporate Clients

  • Restaurants
  • Retail stores
  • Construction
  • Real estate and brokers offices

Professional Staff

Karen Cassidy, CPA
Karen Cassidy, CPA

Karen Cassidy, CPA

Karen was born and raised in Santa Barbara, California where she met her husband during her senior year in high school. Eager to get on with “real life” she put her nose to the grindstone and graduated cum laude from Biola University in three years, receiving her Bachelor of Science degree in Accounting in 1983. Karen received her CPA license in 1986 at the age of 23. After five years in Orange County, Karen and her husband returned to the coast, spending four years in Avila Beach before settling in Arroyo Grande in 1991. In addition to two biological children, her family includes two teenagers she and her husband adopted from Ethiopia in 2011. As a small town CPA, Karen is able to provide your firm with accounting services and financial statement preparation. She prepares partnership, corporation, LLC, estate, trust and individual income tax returns. Karen began working with Mark Clark, CPA in 1992. The firm was renamed Clark & Cassidy, Inc. in December 2013. Upon Mark’s retirement in 2016, Karen became the sole owner of the firm.

Denise Jannopoulos, CPA
Denise Jannopoulos, CPA

Denise Jannopoulos, CPA

Denise was born and raised Southwestern Michigan. She moved to Agoura, California while in high school. Shortly thereafter, she met the love of her life, Brian, they were married and moved to Arroyo Grande and raised two beautiful children, Heather and Randy. Denise went back to college while Randy was a senior in high school to earn her Bachelor of Science degree in Business Administration from Cal Poly San Luis Obispo in 2003. Upon graduating, she worked for Barbich, Longcrier, Hooper and King in both San Luis Obispo and Santa Maria. Denise has worked with Clark & Cassidy (and formerly Mark Clark, CPA) since 2007. Denise specializes in taxation with an emphasis on individual and gift tax returns.

S. Dana Senes, CPA
S. Dana Senes, CPA

S. Dana Senes, CPA

Dana grew up in Orange County and met her husband in an elevator in Nagasaki Japan. She now resides in Arroyo Grande and has been with the firm since 2016. She brings with her many years of experience both in industry and in public accounting. She has worked locally at Radakovich Shaw, Eggen & Associates and GBP&B. Dana was also a partner in the Studio of Performing Arts in Arroyo Grande in the early 90’s. Dana has extensive experience in complex and multi state individual tax return preparation as well as business entities. She went back to school when her children were in elementary school and graduated from Cal Poly in 1997. She received her CPA certificate in 2003.

Debbie Lacey
Debbie Lacey

Debbie Lacey

Debbie has lived in Arroyo Grande since she was a toddler. She attended Arroyo Grande High School and met her husband locally in 1985. They have raised six children together and currently have ten grandchildren. Her husband Barry is the founder of Lacey Plumbing in Grover Beach. Debbie is our office manager and is an invaluable part of the firm. She has worked with Clark & Cassidy (and formerly Mark Clark, CPA) since 1997.

Mark Clark CPA
Mark Clark, CPA

Mark Clark, CPA

(Retired; December 2016)