It was the first time he finished a marathon in under 2 hours, 10 minutes.
Johnson is a seven-time NASCAR champion who took advantage of NASCAR's schedule this year - the race at Richmond was on Saturday - to fulfill his goal of running the Boston Marathon.
Kenya's Lawrence Cherono led home the men's race in 2:07.57 with his compatriot Kenneth Kipkemoi in third behind Lelisa Desisa Benti from Ethiopia. A mere two seconds separated Cherono and Desisa, who went step-for-step during the final stretch before the former crossed the finish line a few steps ahead of the runner-up.
Following Simmons were fellow Lewiston residents Alan Groudle, whose time of 2:57:32 was good enough for 2,078th, and Dan Pontbriand, who finished in 2:57:48 as the 2,125th finisher.
World's largest aircraft capable of launching vehicles in space successfully flight-tested
If fruitful, such a task would be a less expensive approach to release objects into space than rockets terminated from the ground. Thomas said this flight started out like those previous tests until they throttled up and did a rotation maneuver to take off.
In the men's race, the halfway point was passed in 64:28 and the lead group - led by Kenya's Geoffrey Kirui, Ethiopia's Lemi Berhanu Hayle and USA's Scott Fauble - remained 11-strong at 20 miles, where the clock showed 1:38:37.
Brooke-Alvinston's "Marathon Mom" had another impressive run at this year's Boston Marathon.
In the women's elite race, Worknesh Degefa won with a time of 2:23:31.
The elite women's race was a different story.