To runners, he'd say, "we have the technology to get you back to your sport."
In addition to, or perhaps because of, the advances in prosthetics that allowed Oscar Pistorius, the Blade Runner, to compete in the Olympics, and allows others to run marathons, people's perceptions have changed.
"People are much more comfortable showcasing their apparatus without qualms," Esquenazi said.
Jeff Glasbrenner, who has been an amputee since age 8, was finishing the marathon when the bombs went off.
"I wish I could reach out to the people who lost a leg," he told the New Republic. "I'd love to run a race with them."
Even with all the technology in the world, adjusting to life without a limb will be challenging. For many amputees, the sensation of a phantom limb never fully goes away, and some experience excruciating phantom limb pain. But experts suspect that people such as Glasbrenner may ease the transition.
"This is going to be a process -- it's not a single episode," Esquenazi said. "But with time, and in stages, they are going to succeed. We're going to stand behind them and try to help these individuals function at the highest level they can. They have the emotional support of the country behind them."