Peterson Sullivan

Peterson Sullivan was a prominent accounting and advisory firm headquartered in Seattle, Washington, with a specialized focus on the life sciences, technology, and non-profit sectors. The firm provided a comprehensive suite of services including audit, tax compliance, and business consulting specifically tailored for biotechnology, pharmaceutical, and medical device companies. Known for its deep roots in the Pacific Northwest innovation ecosystem, Peterson Sullivan helped emerging and established health-tech entities manage financial growth, R&D tax credits, and complex regulatory requirements. In early 2020, the firm merged with Armanino LLP, one of the largest independent accounting and business consulting firms in the United States, integrating its specialized life sciences practice into Armanino's national platform.