Is there "behind the scenes" work in the Public Health field

Is there "behind the scenes" work in the Public Health field?
Are there any jobs in Public Health where I can work "behind the scenes?" I'm a very quiet person, I don't like doing presentations and talking in front of people. I want to get my Masters in Public Health, because I want to prevent disease and promote overall good heath in communities and society. Anything I can do in Public Health that doesn't require a lot of talking? Can I work "behind the scenes?"
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Absolutely. There a all kinds of jobs analyzing the data, scheduling, tracking, investigating etc etc. Probably 5 people work behind the scenes to every one in the public. I have a friend who got a Dr in PH and he does industrial hygiene--for the oil refineries. Many jobs come off of PH.