To be entirely meticulous about the genealogy, I think Wirth was at PARC in 01976, and what inspired him most there was Mesa; Lampson first described (Mesa's successor) Cedar in PARC TR CSL-83-15, Xerox Palo Alto Research Center, December 01983, and without rereading the report, I think Cedar's development began about 01981. So Cedar is Oberon's sibling, not its parent.
The connecting link at ETH between Mesa and Oberon was the Lilith workstation with its system software written in Wirth's Modula-2 (01977–01984).
As for Golang, the relationship is much more direct! The first public version of Golang is mostly a slightly modified version of Pike's Newsqueak, but at the point Golang became Golang, Pike was working with Griesemer and Thompson. IIRC Griesemer did his dissertation under Wirth at ETH on extending Oberon to parallel computers.
The connecting link at ETH between Mesa and Oberon was the Lilith workstation with its system software written in Wirth's Modula-2 (01977–01984).
As for Golang, the relationship is much more direct! The first public version of Golang is mostly a slightly modified version of Pike's Newsqueak, but at the point Golang became Golang, Pike was working with Griesemer and Thompson. IIRC Griesemer did his dissertation under Wirth at ETH on extending Oberon to parallel computers.