Baseball coach Pat Ryan remembers Martin Richard’s “very sharp sense of humor,” especially when he caught the 7-year-old smiling when a teammate had a mouth full of bubble gum.

Running coach Vicky Shen looks back at how the energetic boy used to crack jokes with his friends during practice. “Martin really was somebody all of the kids loved to be with,” she says.

The world knows Martin Richard for the powerful poster he created during a second-grade class assignment about nonviolent protest that read “No more hurting people — Peace.”

Martin died at age 8, a pair of terrorists cutting his life short when they bombed the Boston Marathon on April 15, 2013.

Ten years later, the Dorchester boy’s simple and profound legacy carries on through the Martin Richard Foundation, which his parents Bill and Denise created within a year of the bombings.

The foundation has invested millions into community programs that work to advance inclusion, kindness, justice and peace — values that Martin found pride in, even at his young age.

Dozens of runners on Marathon Monday will sport yellow singlets that carry ‘Peace’ on them for Team MR8, a tradition that started in 2014. More than 1,000 runners have raced for the team, raising more than $6 million for the foundation over the years.

A bronze statue of Martin holding his famous sign can be found at Bridgewater State University, where his parents met each other as students. The college has a center named the ‘Martin Richard Institute for Social Justice,’ which focuses its work around community building, social justice education, and civic engagement and action.

“Martin was a remarkable young man, and his family is a remarkable family,” the center’s executive director, Jill Beckwith, told the Herald. “They have truly used this horrible experience that happened to them and so many people for good in the end; they have kept up his legacy, they have been able to bring people together.”

Ryan vividly remembers the tragedy that killed three and injured hundreds more. He had been walking out of the Prudential Center, where he works, to see a friend run down Boylston Street, but as he got halfway out of the mall, he heard a bomb go off.

Ryan didn’t learn until hours later that Martin died, his 7-year-old sister Jane lost part of her leg, his mother Denise lost sight in her right eye and his father Bill lost some of his hearing. Martin’s 11-year-old brother Henry got out unscathed physically but endured mental pain.

The family had been cheering runners on as they crossed the finish line when that joy turned suddenly to chaos.

“With people you know, it’s really shocking,” Ryan said, “and when you know the 8-year-old, it’s like … you don’t want to know anybody, but you definitely don’t want to know the 8-year-old who died.”

Being a board member for the Martin Richard Foundation has allowed Shen to turn her grief from the aftermath of the attacks into motivation to do something positive for the community.

Shen called the board’s work “amazing,” especially when she looks at all the opportunities the foundation is presented with through its partner organizations.

Assistance could be as little as donating hundreds of dollars for a partner to purchase food for an event or as big as donating tens of thousands of dollars to help a nonprofit get “to the next level.”

Shen on Monday will be running in her sixth marathon for Team MR8, and some of her teammates are 18- to 20-year-olds she used to coach. This is the last race the Richard family plans to field a team, but Shen said she’s confident Martin’s legacy will continue to grow.

The reaction from the community toward the foundation and Team MR8 has changed over time, Shen said.

“Now, people say ‘Thank you’ because they see the impact that we’re having on the community whereas before it was more like they just wanted to give you a hug,” she said. “There’s a lot of reflection that goes into 10 years.”

Ryan is a coach for Challenger Sports, a foundation initiative that pairs athletes with learning and developmental challenges with peer buddies. The program is run at Savin Hill’s McConnell Park, which underwent a $7.1 million renovation last year that improved accessibility for athletes of all abilities.

A little over four miles away is a park in the Seaport named in honor of Martin.

Martin’s Park is on the waterfront next to the Boston Children’s Museum and features an accessible playground, water play garden, amphitheater, a pirate ship and plenty of open space. Five cherry trees planted at the park are in memory of those who died during the bombings or in the aftermath — Martin, Sean Collier, Dennis Simmonds, Krystle Campbell and Lingzi Lu.

The foundation is working on a project that would bring a 75,000-square-foot field house to Dorchester’s Harbor Point neighborhood. The facility would feature recreational and athletic opportunities for people of all ages and abilities.

“Did Martin say to do it? No, he didn’t, but that’s what his family is focused on as making part of what his legacy would be,” Ryan said of the contributions the foundation has made to the community. “If each of us could have just a little sliver of some kind of legacy like that, we’d leave the world a better place.”