Gunner works to help NGOs, activists, foundations and software developers make more effective use of technology for social change. He has worked in numerous technology environments from NGO to Silicon Valley start-up to college faculty to large corporation, serving in senior management, engineering, teaching and volunteer roles. He is an experienced facilitator with a passion for designing collaborative open learning processes, and is an active facilitator, contributor, advisor, and/or partner in a number of open projects, including The Tor Project, OpenReferral, Open Architecture Collaborative, Humanitarian OpenStreetMap Team, Simply Secure, and Mozilla. He is a board member of The Ruckus Society, Global Exchange, and Peer 2 Peer University, and also serves in formal advisory roles with SAFETAG, CorpWatch, LocalizED, Ranking Digital Rights, The Center for Tech Cultivation, DATA Uruguay, Libraries.io, Social Movement Technologies, The Engine Room, The Everett Program, United for Iran, and The Rosetta Foundation. He believes in melding hard work with serious fun.

The common thread that connects all facets of Gunner's work is a focus on open approaches to capacity building and knowledge sharing in social change efforts. Aspiration prioritizes work that supports and contributes to open communities of practice who create technology and content that benefit nonprofit and foundation efforts. Over the past twelve years, the organization has designed and facilitated almost 500 extremely open learning and knowledge sharing events, in over 40 countries across the globe, predicated on a philosophy of active participation that puts each participant “in control of their own destiny”, in contrast to approaches that place audiences in passive listening roles. Aspiration publishes all licensed work products, including software tools, books, papers and training materials, under open licenses; for published documents and media, the Creative Commons Attribution Share Alike, and for software the GNU General Public License whenever possible.