The Ultragenyx Mafia
6 people came through Ultragenyx and went on to found or lead other companies.
Ben AuspitzDirectorFounded Dimension Therapeutics +1Linda TsangSenior Administrative Assistant, FinanceFounded NGM BioYael WeissVP Business DevelopmentFounded Mahzi TherapeuticsJayson DallasChief Commercial OfficerFounded Aimmune TherapeuticsEric YuenChief Medical OfficerFounded SpirovantJohn C. KlockFounding Board Member and Seed InvestorFounded QT Ultrasound
Frequently asked questions
- What is the Ultragenyx mafia?
- The Ultragenyx mafia is the network of 6 people who came through Ultragenyx and went on to found or lead other companies, including Dimension Therapeutics, NGM Bio, Mahzi Therapeutics, Aimmune Therapeutics, Spirovant.
- Who is in the Ultragenyx mafia?
- Notable members include Ben Auspitz (Dimension Therapeutics), Linda Tsang (NGM Bio), Yael Weiss (Mahzi Therapeutics), Jayson Dallas (Aimmune Therapeutics), Eric Yuen (Spirovant), John C. Klock (QT Ultrasound).
- What companies did Ultragenyx alumni found?
- Companies founded by Ultragenyx alumni include Dimension Therapeutics, NGM Bio, Mahzi Therapeutics, Aimmune Therapeutics, Spirovant, QT Ultrasound.



