We work behind the scenes to keep your business organized, compliant, and moving forward.

Based in Petaluma, California, Celium serves more than 50 businesses across industries like retail, interior and landscape design, hospitality, construction, wellness, and more. With a sharp team of accounting and administrative professionals, we build tailored support systems to meet the unique needs of nearly any small or mid-sized business.

Along with the fundamentals of bookkeeping, accounting and administration we can keep our clients on top of their regulatory filings, tax obligations, insurance needs and more—so each business can focus on what they do best. Our philosophy is simple: accounting data should be timely, accurate, and clearly presented. When done right, it becomes actionable insight that drives better decisions and long-term growth.

Celium was founded by Darren Racusen, who brings 15 years of experience in finance, accounting, and business administration. His background also includes city planning and construction entitlements, giving him a practical edge when working with business owners, developers, and creative professionals. Darren lives in Petaluma, California, with his wife and two dogs.