Harvard University's website describes Dr. Andrew Fauci as follows:

Dr. Fauci is an immunologist and has served as the Director of the National Institute of Allergy and Infectious Diseases since 1984, where he oversees research to diagnose, prevent, and treat infectious diseases such as HIV/AIDS, malaria, and tuberculosis.

WIVB News report.
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The opening pitch is has been thrown by many celebrities over the years.  Here are some other celebrities who have thrown the 1st pitch.

According to people.com here are a few celebrities who threw "the 1st pitch' who you may know very well:

Simone Biles: (according to people.com)

The celebrated Olympic gymnast wowed the crowd with an incredible flip before throwing a perfect pitch ahead of the 2019 World Series Houston Astros vs. Washington Nationals game.

Kanye West: (according to people.com)

The Chicago native and his then-2-year-old son Saint each took turns throwing their first pitches before the Chicago White Sox and Chicago Cubs faced off in 2018.