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About Us

About Our Firm

Opdahl & Rachmanony LLP provides quality, personalized financial guidance to local individuals and businesses. Our expertise ranges from basic tax management and accounting services to more in-depth services such as audits, financial statements, and financial planning.

Opdahl & Rachmanony LLP is one of the leading firms in and throughout the area. By combining our expertise, experience and the team mentality of our staff, we assure that every client receives the close analysis and attention they deserve. Our dedication to high standards, hiring of seasoned tax professionals, and work ethic is the reason our client base returns year after year.

Our Mission

Our mission is to help clients maintain financial viability in the present, while taking a proactive approach to achieve future goals. This requires open communication to reach an understanding of our clients' needs through research and sound analysis. Opdahl & Rachmanony LLP is dedicated to meeting these goals with high standards of excellence and professionalism. We have been a staple of the area's business community for years, and pride ourselves on the level of esteem we have earned.

Our dedication to hard work has earned the respect of the business and financial community in and around the area. We believe this to be a direct derivative of our talent and responsiveness to our client base. Whether you are a current or prospective client, rest assured that individuals and businesses who choose Opdahl & Rachmanony LLP receive competent and timely advice.

Our Team


As one of the key managing partners of Opdahl & Rachmanony, LLP, Derek Opdahl has over 20 years of experience as a Certified Public Accountant. The majority of Derek’s clients stem from but not limited to the apparel, jewelry, construction, security, retail, air conditioning, refrigeration, restaurant, real estate, and other service industries.

His specializations are wide and can range from attestation to taxation. Yet to highlight a few, he places great care on providing excellent tax work especially to individuals and corporations. Derek’s attention to detail when it comes to audits, review and compilation are second to none. And he does take great joy in providing financial benchmarks, projections or cash flow analysis to ensure that all clients walk away with a positive experience.

In addition to the practice, Derek serves as the treasurer of “Southwest Crude Corp.” and president of “Woodland Hills Oil & Gas, LLC.” He earned his Bachelor of Science from California State University, Northridge. When he is not working, he enjoys a round of golf, skiing and cross country races throughout Southern California.

He is a member to California Society of CPAs and American Institute of Certified Public Accountants (AICPA).


For more than 30 years, Alex has served clients in a wide range of industries, including the apparel, jewelry, vitamins and supplements, consumer electronics, furniture, real estate, and retail industries. He provides his clients full-service consultation, including financial reporting for audits, reviews, compilations, obtaining financing, financial benchmarking, profitability studies and reconciliations, financial forecasting and projecting, tax planning and compliance, and tax audit representation.

Alex has served as past president of Sephardic Temple Tifereth Israel, and as Treasurer of West LA Little League. Alex enjoys working on his 1972 Jensen Healey, and building star wars themed Lego sets.

B.S., California State University, Los Angeles
Certified Public Accountant (CPA), licensed in California; Member, California Society of CPAs;
Member, American Institute of Certified Public Accountants (AICPA)

SUSAN AVENDANO, CPA 818-865-1570

Susan has been helping small companies with their bookkeeping and tax preparation for over 30 years. Susan provides her clients with bookkeeping and write-up, tax projection and preparation services, Quickbooks accounting help and assistance and tax audit representation. She works with clients in various professions, including medical, dental, consulting, and construction.

B.S., California State University, Northridge
Certified Public Accountant (CPA), licensed in California.


Lindsay is a skilled accountant with over ten years of experience and has been preparing tax returns since 2015. Lindsay’s experience in bookkeeping, individual tax return preparation and payroll covers many industries, including real estate, health services, construction and entertainment. Lindsay assists clients with bookkeeping in Quicken and Quickbooks, financial reports, tax projections, audit representation and more.

Enrolled Agent (EA); Member, National Society of Accountants (NSA)


Carrie has worked in the accounting field for over five years and provides bookkeeping services using Quicken and QuickBooks, prepares 1099s, Statements of Information and Sales Tax Returns, among other services. Before switching to accounting, Carrie earned a B.A. in Anthropology from UC Davis, and had an internship in zooarchaeology at Tel Aviv University. She is currently taking accounting and business courses through UCLA Extension.

Carrie enjoys watching anime and is an avid keychain collector.


Ashlie is an experienced Office Manager with a knack for numbers and is looking to gain more hands on experience in the accounting side of business. After attaining her B.A. in Biology and Fine Arts from Hofstra University, she decided to pursue her own entrepreneurial aspirations in art and storytelling. Outside of work Ashlie enjoys making comics and playing spooky video games.


Zak Lakhani, CPA is a senior manager with over 20 years experience in financial statement preparation, assurance services, tax preparation and business consulting. Zak has spent many years in private industry working as CFO of several local companies as well as having been a financial analyst for a major insurance carrier.

Brian Martin 818-865-1570

Before switching career paths into the accounting field, Brian has had more than 7 years in experience managing operations in the area of logistics and shipping. Currently as one of the staff accountants of Opdahl & Rachmanony, Brian provides bookkeeping services, prepares tax returns ranging from Individual to S-Corps, as well as Sales Tax returns to name a few. Brian’s background consists of a B.S in Management and B.S in Health Sciences & Biomechanics from Hofstra University. When he is not working on tax returns Brian enjoys reading, cooking, weightlifting, and is an avid rower/oarsman with the Los Angeles Rowing Club. Brian is currently taking courses through Santa Monica College to complete the accounting requirements in order to take the CPA exam.

  • Opdahl & Rachmanony, LLP
  • 21860 S Burbank Blvd
  • Suite 110
  • Woodland Hills, CA 91367
  • Telephone: (818) 762-2597
  • Fax: (818) 762-4916