Gregg Kellogg
Invited Expert at W3C
San Rafael, California, United States
Summary
🤩
Rockstar🎓
Top SchoolGregg Kellogg is a seasoned software systems architect and W3C Invited Expert with over 16 years focused on Semantic Web technologies, RDF/JSON-LD, and backend systems built in Ruby. He has been the primary implementor of key RDF and SPARQL tooling for Ruby and has contributed to flagship projects and specs—including JSON-LD libraries and the schema.org test infrastructure—helping bridge specifications and practical tooling. Gregg’s background spans UNIX kernel development at Hewlett-Packard to senior technical and advisory roles across media, standards, and metadata companies, giving him rare depth across low-level systems and web standards. Based in San Rafael, he combines hands-on implementation, specification editing, and CI/test engineering to ensure semantic systems are both correct and production-ready. Though mostly retired, his active commit history shows he still prefers shipping precise, standards-driven solutions over theory.
16 years of coding experience
22 years of employment as a software developer
BA, Math, BA, Math at Humboldt State UniversityUniversity of California, Los Angeles
English, German, French, Vietnamese, Spanish, Italian
Stackoverflow
1,851reputation
40kreached
69answers
0questions
rdf
top-5%
Github Skills (25)
json10
javascript10
python10
api-design10
testing10
semantic-web10
cicd10
linked-data10
ruby10
web-standards10
json-ld10
rdf10
w3c10
documentation10
rspec9
Programming languages (21)
Github contributions (5)
json-ld/json-ld.org
May 2011 - Oct 2022
JSON for Linked Data's documentation and playground site
Role in this project:
Back-end Developer
Back-end DeveloperContributions:13 reviews, 786 commits, 197 PRs in 11 years 6 months
Contributions summary:Gregg's commits focus on updating specifications for differences and publishing, particularly within the context of JSON-LD syntax and API specifications. They made modifications to the "spec/latest/json-ld-syntax" and "spec/latest/json-ld-api" directories, suggesting a role centered around maintaining and refining the core components of the JSON-LD library. The changes include updates to the handling of various data structures within the API.
json-ldapijsonldlinked-datasemantic-web
digitalbazaar/pyld
Jan 2018 - Apr 2020
JSON-LD processor written in Python
Role in this project:Back-end Developer
Back-end DeveloperContributions:111 commits, 13 PRs, 70 pushes in 2 years 2 months
Contributions summary:Gregg contributed to the core functionality of the `pyld` library, which is a JSON-LD processor written in Python. Their work focused on implementing features related to context handling, including scoped contexts, and handling of the `@import` directive. The user also made improvements to the compaction algorithm to handle nested values and graphs, as well as contributing to improvements in the toRDF process. Additionally, the user addressed various syntax errors and edge cases within the context processing and JSON-LD parsing logic.
json-ldpythonlinked-datasemantic-webrdf
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