Tessera Therapeutics Appoints Joseph Romanelli as CEO

July 24, 2026 | Friday | Leadership Change

Tessera Therapeutics, the biotechnology company pioneering a new approach to genetic medicine known as Gene Writing, announced the appointment of Joseph Romanelli as President and Chief Executive Officer. Romanelli succeeds Michael Severino who has led the company since June 2022. Romanelli will join Tessera's board of directors and also join Tessera's founder, Flagship Pioneering, as a CEO-Partner.

"Over the past several years, Tessera has established the scientific and technological foundation for Gene Writing. The company's next chapter is translating that foundation into a broad portfolio of medicines and Joe is the right leader to guide that transition," said Geoff von Maltzahn, Ph.D., co-founder, founding CEO, and Chairman of Tessera and General Partner at Flagship Pioneering. "Joe has spent more than three decades building teams, forging partnerships, and commercializing innovative medicines across global markets. His experience scaling organizations, leading international businesses, and bringing breakthrough therapies to patients makes him exceptionally well suited to lead Tessera as it evolves from a company focused primarily on platform innovation and preclinical development into one capable of realizing the full potential of Gene Writing."

Von Maltzahn continued: "We are deeply grateful to Mike Severino for his leadership over the past four years and wish him every success in the future as he embarks on a new role leading a commercial stage biotech company."

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