BALTIMORE (WJZ) — A retired anesthesiologist is walking to all 30 Major League Baseball stadiums across the country to bring awareness to patient and health worker safety.

Dr. Dave Mayer serves a leadership role at MedStar Health.

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He has put in 1,100 virtual miles across the U.S. with 16 stadiums to go.

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He says people don’t realize preventable medical harm is the third leading cause of death in the U.S.

Saturday’s nine-mile walk was to Camden Yards.

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If you’d like to join Dr. Mayer, download the Charity Miles app and select the Patient Safety Movement Foundation.