Management
Investor Relations
Tony Isaac
President & Acting Chief Executive Officer
Tony Isaac is the President, Acting CEO, and Board Director of ALT5 Sigma. He has been a Director since 2015 and previously served as CEO in 2016. Mr. Isaac is also the Chairman and Co-Founder of Isaac Organization, a private investment firm, and brings over 40 years of experience in real estate, corporate finance, and strategic transactions. He specializes in complex deal negotiations and financial structuring, and supports ALT5 Sigma’s growth and corporate strategy.
Steven Plumb
Chief Financial Officer
Steven Plumb is an experienced Certified Public Accountant. Mr. Plumb has served as fractional Chief Executive Officer of Prophase Labs, Inc. (NASDAQ: PRPH) since August 2025 and has served as Chief Financial Officer of Driveitaway Holdings, Inc. (OTC:DWAY) since April 2024. From September 2023 to November 2024, Mr. Plumb served as the Chief Financial Officer of A Game Beverages, Inc. From August 2022 to June 2024, Mr. Plumb served as the Chief Financial Officer of Endexx Corp. (OTCBB:EDXC). From October 2020 to July 2023, Mr. Plumb served as the Chief Financial Officer of Gaming Technologies, Inc. (OTCBB:GMGT). From January 2020 to March 2023, Mr. Plumb served as the chief financial officer of Directview Holdings, Inc. (OTCBB:DIRV). Since 2001, he has served as the owner and president of Clear Financial Solutions, a consulting firm that provides interim Chief Financial Officer services to small public companies. In this capacity he has prepared SEC filings, managed investor relations, raised capital, conducted mergers and acquisition activities, developed successful offering memorandum, registration statements and investor presentations. Mr. Plumb is a former auditor with PriceWaterhouseCoopers and KPMG. Mr. Plumb has a Bachelor of Business Administration degree from the University of Texas at Austin, Austin, Texas.
Vay Tham
Chief Revenue Officer (CRO), President Fintech
Vay Tham, who most recently served as PI Financial Corp.'s (Ventum Financial), Managing Director, Head of Technology Investment Banking, has over 25 years' experience in capital markets. Vay's career has spanned research, investment banking, and finance roles. In addition, Mr. Tham previously founded, grew, and sold his own fund, which had over $300 million of assets under management. Vay has predominantly focused on technology companies throughout his career.
