Hogg has been among the most vocal of the survivors in the Feb. 14, 2018, shooting at Marjory Stoneman High School in Parkland, Florida, where 17 students and staff were killed after a former classmate who allegedly opened fire with an AR-15-style rifle.

In the months after the mass shooting, Hogg and many of his classmates spent much of his time speaking out against gun violence and encouraging young people to vote, harnessing the power of social media -- hashtag, #NeverAgain -- to spread the message.

\"PHOTO:
Wilfredo Lee/AP, FILE
PHOTO: David Hogg, a senior at Marjory Stoneman Douglas High School, poses for a photo at Pine Trails Park, in Parkland, Fla., May 29, 2018.
>

In late March, he appeared at the March for Our Lives rally in Washington, D.C., where hundreds of thousands of people attended to support the cause.

“I don’t think I really ever saw myself as an advocate before,” Hogg told ABC News’ “Nightline” in a June interview. “I felt a necessity to speak out — as kind of the main architect behind the messaging of #NeverAgain because I was really one of the first people to do that and I was the first person, really, on camera from our school at the time.”

A few days after that rally, Fox News’ Laura Ingraham posted a tweet mocking Hogg for not being accepted into four colleges that he had applied to, including UCLA. Later that day, Hogg responded with a list of Ingraham’s sponsors and called on his followers to pressure her advertisers.

David Hogg Rejected By Four Colleges To Which He Applied and whines about it. (Dinged by UCLA with a 4.1 GPA...totally predictable given acceptance rates.) https://t.co/wflA4hWHXY

— Laura Ingraham (@IngrahamAngle) March 28, 2018

Pick a number 1-12 contact the company next to that #

Top Laura Ingraham Advertisers
1. @sleepnumber
2. @ATT
3. Nutrish
4. @Allstate & @esurance
5. @Bayer
6. @RocketMortgage Mortgage
7. @LibertyMutual
8. @Arbys
9. @TripAdvisor
10. @Nestle
11. @hulu
12. @Wayfair

— David Hogg (@davidhogg111) March 29, 2018

The next day, Ingraham posted an apology in which she said, “On reflection, in the spirit of Holy Week, I apologize for any upset or hurt my tweet caused him or any of the brave victims of Parkland.”

However, it was too little too late, as companies, such as Wayfair, TripAdvisor and Nutrish, were already in the process of pulling their ads from her show.

\"PHOTO:
AP
PHOTO: Marjorie Stoneman Douglas High School student David Hogg speaks as demonstrators lie on the floor at a Publix Supermarket in Coral Springs, Fla., May 25, 2018.
>

Any student should be proud of a 4.2 GPA —incl. @DavidHogg111. On reflection, in the spirit of Holy Week, I apologize for any upset or hurt my tweet caused him or any of the brave victims of Parkland. For the record, I believe my show was the first to feature David...(1/2)

— Laura Ingraham (@IngrahamAngle) March 29, 2018

Hogg spent much of this year since the shooting lobbying for gun regulations in Washington, D.C., and across the country. Along with other student activist leaders, including Marjory Stoneman’s Emma Gonzalez and Cameron Kasky, he co-founded the March for Our Lives: Road to Change tour, which took place in 68 cities over the summer.

Though Hogg will be attending Harvard for the first time as a student, he is not new to the school -- he’s already spoken there twice this year, in March and September.

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