CDC Director, Rochelle Walensky, a physician-scientist resigns from her position as CDC Director on June 30, 2023. During her period at CDC about 670 million vaccine doses were given. It was also a period when there were differences of opinion on mask use and other preventive action for covid. As a physician scientist Walensky had no experience managing organizations and difficulty managing CDC's workforce of 11,000 employees, says this report in NYT. CDC guidance was often confusing during the pandemic and management changes in the CDC will continue to affect the organization's effectiveness.