"I direct the Johns Hopkins Center for Gun Policy and Research, and have been conducting research on gun policy for the past 23 years. Over this time, I have led numerous studies related to gun violence and published the results in 78 articles in scientific journals," Webster wrote in a letter to the editor that appears in its entirety on Page A8. "Those journals require that articles be independently reviewed and vetted by other experts in the field before accepting them for publication...The principle of academic freedom is one of the standards of responsible conduct of research I follow as a faculty member of Johns Hopkins University. This stipulates that the design, conduct and reporting of research must be independent of potential influence or biases from the funding source. Mayor Bloomberg does not dictate, oversee or vet my research, nor has he ever attempted to influence anything that I write or say pertaining to gun policy."