Chain Reaction unfortunately closed early last year. Certainly a big loss for a city that has a swiftly growing bike presence.
But fear not! Cycling in DC will not die. Some people still out here riding...

Forwarded message:
Hi Danielle,
Thanks for asking!  As for DC, no but YES! None formerly within the district, but some great options in the area.
Mount Rainer Bike Co-Op - the only collectively run shop in the area that I know about. They have great community presence and are the only mainly adult focussed non-for-profit shop in the area.
Phoenix Bikes - not a collective but a youth development, non-profit community shop just outside the city in South Arlington (i am staff there and live in dc, as do many volunteers). We have volunteer shop nights and are in the process of starting some open shop and adult instruction sessions, plus bikes, frames, parts, etc. for sale.
Renaissance Bike Shop - in Riverdale, MD, north of the city. Not a collective either, but linked to the Engaged University and doing work with youth and other great community members.
Rockville Youth Bike Project - linked to Bikes for the World, up near shady grove, in maryland. A great big ole barn where volunteers and students help process bikes for shipment abroad and learn the ropes.
Great people all! All should be easy to find on google - if not, don't hesitate to pass on my info to your friend and I'll help get him in touch with everyone,
Best,
Colin