Josh Stark, a key researcher and project manager at the Ethereum Foundation, announced his departure on Thursday after five years with the organization. Stark did not specify his reasons for leaving but mentioned he will take time off to focus on family and friends. He reflected on the Ethereum ecosystem's accomplishments, stating, "The Ethereum ecosystem has reliably done things the world told us were impossible." Stark's exit is significant, particularly as it follows Ethereum co-founder Vitalik Buterin's announcement of major leadership changes in January 2025, aimed at addressing community criticisms and enhancing the Foundation's direction. Buterin emphasized the need for fresh talent and a commitment to decentralization and faster transaction capabilities. The Ethereum Foundation's new leadership was officially announced in March 2025, with Hsiao-Wei Wang and Tomasz Stańczak appointed as co-directors. Stark's departure, alongside another contributor's resignation, highlights ongoing transitions within the organization as it adapts to evolving challenges in the blockchain ecosystem.