Orange County (949) 495-2700

Riverside County (951) 689-0680






Our Team

Robert J. Casillas, CPA, Founder

Robbie completed his education at California State University in San Bernardino, becoming licensed as a CPA in California, Nevada, and Texas. He enjoys the relationship side of accounting, taking advantage of the opportunity to work directly with clients on a daily basis. He loves talking to people one-on-one, relating to their situations and partnering with them to overcome their challenges. Nothing gives him more personal satisfaction than helping a client plan for their future and then watching them succeed.

As a youth, Robbie had many positive, hard-working role models in his life. Traveling with his parents as a military dependent, Robbie had the unique experience of living overseas as well as most of the continental U.S. He feels this helps him relate to people of all backgrounds. He considers himself lucky to have spent some of his young life working at a farm in New Mexico, owned by his grandfather. Putting in long hours, working hard, and intense discipline were a part of everyday life, and the lessons learned there continue to be relevant. Robbie was inspired and molded by his time at the farm. Today he takes that strong work ethic and pours it into his business.

When he isn’t hard at work in the office, Robbie coaches high school football. He also thoroughly enjoys boxing, which allows him to channel his energy into a physical activity that benefits mind, body and spirit. He is the proud father of triplets (two girls and one boy) and loves spending time with his family. Robbie’s biggest aspiration is to create a charitable foundation that would allow him to give back to local communities.


Business Management

Robbie’s wife Christina has worked for Casillas Accountancy Group since its inception in 1996, beginning with small tasks to assist daily operations, in addition to working full time for a local law firm. With the birth of their triplets in 1999, Christina began taking on more responsibilities such as managing payroll and health insurance. Her duties have grown over time to also include assisting in bookkeeping, tax file preparation for presentation, and company travel. She fills in as needed, and is happy to help with whatever is necessary, whenever necessary.


Staff Accountant

Brenda has been with Casillas Accountancy Group since it began in 1996. Prior to Casillas Accountancy Group she also worked for the previous owner of the firm, totaling an impressive 30+ years in the business. Brenda has handled almost every aspect of the business, focusing on compilation and reviews, bookkeeping, payroll, sales tax, client management and much more. She ensures the smooth daily operation of the firm, and our clients are very appreciative of her experience and expertise.


Samantha is the new girl on the block. She was hired to freshen things up at Casillas Accountancy Group. She is a recent graduate of both Azusa Pacific University and Full Sail University with a Bachelors in Psychology and a Master’s in Public Relations and Communications. Samantha’s main job is to bring a new perspective to the Marketing and Social Media aspect of our firm. Along with the upkeep of our social media, Samantha will also be helping with day to day operations of the firm. Among her many talents, she also co-owns her own small business, The Perfect Princess Company, that specializes in children’s party entertainment. Being a small business owner has helped her develop a true sense of responsibility and a drive to be the best at everything she puts her mind to. Samantha is happy to join the Casillas Accountancy team and help wherever and however she can.