Ian S. Chasse Osborn

Chasse Osborn maintains a broad tax practice, advising clients on domestic and cross-border business transactions across a variety of industries. He regularly advises partnerships, LLCs, C corporations, S corporations and individuals on tax considerations relating to domestic and cross-border mergers, acquisitions, restructurings, financings and other business transactions, representing both public and private companies. 

He also has significant experience advising technology and life sciences companies tax considerations involved with joint ventures, licensing and other intellectual property transactions. 

Chasse also represents developers, syndicators and investors in transactions using federal and state tax credits and incentives, including renewable energy, low-income housing, historic and new markets tax credits.


  • Georgetown University Law Center, J.D., cum laude, 2017
  • Clemson University, B.S., 2009

Bar and Court Admissions

  • Massachusetts


  • ConstructSecure, provider of an SaaS platform that leverages leading risk and financial indicators to accurately pre-qualify subcontractors and vendors to improve safety, in a growth equity investment by Summit Partners
  • Biotechnology ecosystem company Alloy Therapeutics, Inc. with the formation of Broadwing Bio LLC, a joint venture with Maze Therapeutics, Inc., to develop targeted antibody therapies for the treatment of ophthalmic diseases
  • Entegris, a leader in specialty chemicals and advanced materials solutions for the microelectronics industry, in its $36 million acquisition of Global Measurement Technologies
  • LevelUp, a leader in mobile diner engagement and payment solutions for restaurants, in its $390 million sale to online and mobile food-ordering and delivery marketplace Grubhub Inc.


  • IRS Notice 2020-32: Payment of Expenses That Result In PPP Loan Forgiveness Are Not Deductible - May 1, 2020
  • IRS Releases FAQs Clarifying CARES Act Payroll Tax Deferral Provisions - April 28, 2020
  • The CARES Act: Tax Relief Provisions - April 1, 2020

Speaking Engagements

  • "Cannabis Businesses: Essential Tax Planning Considerations," Foley Hoag webinar, September 2020