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It’s Major League Baseball’s opening day.

Up and down the state, fans will head to ballparks to see their favorite players, sample the latest food innovations, drink craft brews and take in some fresh air (weather permitting).

For David Rinetti, first pitch will be both the end of a sprint and the beginning of a marathon.

“I’m not lying when I tell you I probably have about 50 things going on at once,” he said Wednesday morning.

Mr. Rinetti is the vice president of stadium operations for the Oakland Athletics. He’s been in that job since 1994, but started with the team as a high schooler.