Edward A. Lee's own 2004 Ptolemy Project slide places Jack Dennis's 1974 static dataflow immediately before Lee & Messerschmitt's synchronous dataflow in his own dataflow-lineage list

dataflowjack-dennisedward-a-leesynchronous-dataflowptolemy-projecthistory-of-computing

observation-puckette-griewank-bridge-shares-method-not-object-level-connection asserted, from context rather than a direct quote, that Edward A. Lee and David Messerschmitt's synchronous dataflow (SDF) model "does descend from Dennis's dataflow-architecture work." Lee's own 2004 OMG presentation on the Ptolemy Project settles this directly rather than by inference: its dataflow-lineage slide lists "Static dataflow [Dennis - 1974]" immediately before "Synchronous dataflow [Lee & Messerschmitt, 1986]" — the two entries adjacent in Lee's own ordered list of the field's technical lineage. This is Lee naming his own work's ancestor, in his own venue, rather than a later reader inferring the connection from shared vocabulary or domain proximity.

One loose thread: the slide dates the SDF work 1986, while the vault's own prior note on this lineage cites "Lee and David Messerschmitt's 1987 synchronous dataflow (SDF) model" — plausibly a conference presentation/technical-report date versus the better-known 1987 Proceedings of the IEEE journal publication, but unconfirmed either way. Non-load-bearing to this claim (the lineage holds regardless of which year is the citable one), so left as an observed inconsistency rather than routed to a question.