He maintained an office in Edmond Town Hall and was the founder of the Avielle Foundation, created in his daughter's memory, which sought to reduce gun violence.
After Newtown, the parents founded The Avielle Foundation, which supports research into the "neurological underpinnings of violence".
Just last week, Richman spoke at Florida Atlantic University's Jupiter campus about empowering educators to identify mental illness to prevent future school shootings. In a speech in Spokane, Wash., last year, Richman said, "The brain is a wondrous organ, and, like other organs, it can be healthy and unhealthy".
'We feel that the failure to do that led in large part to the tragedy at Sandy Hook'.
After the Sandy Hook massacre, Richman tried to help make sure shootings like the one that killed his daughter wouldn't happen again.
Richman was the founder of the Avielle Foundation, which was named after his daughter Avielle who died in the Sandy Hook shooting in December, 2012.
The lawsuit filed in CT say that Jones' comments on Infowars have tormented them and subjected them to harassment and death threats by his followers.
Meanwhile, FOX 10 has learned there is an Arizona connection with Richman.
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One picture of a Russian-flagged aircraft posted on social media showed men in uniform clustered around the aircraft. The Trump administration has imposed crippling sanctions on the OPEC nation's oil industry.
"My god. This is bad, horrible, devastating news".
Jeremy Richman on the Avielle Foundation:"My wife and I are scientists...."
U.S. Senator Richard Blumenthal of CT called Richman a "good friend, a dedicated father, an esteemed researcher".
Neil Heslin, whose 6-year-old son, Jesse Lewis, was among the victims, said he got to know Richman well. That came a week after a recent graduate, who was close friends with victim Meadow Pollack, killed herself.
His death comes after reports that two Majory Stoneman Douglas High School students took their lives in separate incidents, a little over a year after a gunman opened fire there, killing 17 people.
Also, the Tucson Sentinel newspaper is reporting that Richman graduated from Sabino High School in 1988.
Multiple suicides among mass shooting survivors can be alarming, but mental health experts said the Florida deaths are not surprising.
Nineteen other students and six staff members were killed that day in the Newtown school.