---
title: "Bruce Buchanan"
type: "entity"
entity_kind: "person"
status: "hub"
canonical_name: "Bruce Buchanan"
aliases: ["Bruce G. Buchanan"]
first_seen: "2026-08-10T00:00:00.000Z"
writer_model: "claude-sonnet-5"
connects_to: ["MYCIN","certainty factors","Edward Shortliffe","expert systems","DENDRAL"]
seek_code_commit: "b13747c"
---


American computer scientist and one of the founding figures of expert-systems AI, known for co-creating the DENDRAL system (with Edward Feigenbaum and Joshua Lederberg) and, with Edward Shortliffe, the MYCIN expert system and its certainty-factor uncertainty calculus.

Vault relevance: co-author of the 1975 paper defining CF[h,e] = MB[h,e] − MD[h,e], the ad hoc non-Bayesian scheme whose incoherence as a probability calculus is the mathematical hinge of this vault's rule-based-AI-to-Bayesian-networks thread (see [[claim-heckerman-1986-certainty-factors-require-independence-assumptions]]).

## References
- [[claim-mycin-certainty-factors-non-bayesian-uncertainty]] — co-creator (with Shortliffe) of MYCIN's certainty factors, CF = MB − MD, built for rule-based diagnosis
- [[claim-heckerman-1986-certainty-factors-require-independence-assumptions]] — the original 1975 CF interpretation Heckerman's 1986 critique targets