On February 2, 2023, SELLAS Life Sciences Group, Inc. appointed John T. Burns, the Company's Senior Vice President, Finance and Chief Accounting Officer, as the Company's Chief Financial Officer and principal financial officer. Mr. Burns, age 37, joined the Company in May 2013 and has held various positions of increasing responsibility during his tenure, including his current position of Senior Vice President, Finance and Chief Accounting Officer which he has held since January 5, 2022. Prior to joining the Company, Mr. Burns was a Securities and Exchange Reporting Manager at Pixelworks, Inc, and began his career in public accounting at Moss Adams LLP.

Mr. Burns received a B.S.M. in Finance and Master of Accounting degree from Tulane University. He is an active Certified Public Accountant.