I thought I knew a lot about Borland's history, but what I didn't know was that the original team left Borland in 1987 to form JPI (Jensen & Partners), headquartered in London, taking a bunch of in-progress code with them that they bought from Borland for $1.7m. JPI made a range of development tools called TopSpeed, which I remember hearing about back then. Unlike Borland's language tools, TopSpeed was a unified compiler backend with a frontend compiler for each language.
JPI eventually merged with Clarion, which made a "4GL" IDE with its own crude Pascal-esque programming language that at one point competed with Microsoft Access, as well as with database-focused IDEs like Microsoft's Visual Basic and Borland's own Delphi. Clarion still exists, though it's now owned by a company called SoftVelocity, and is built on .NET, and looks like it's barely on life support.
Of the original Borland founders, I don't know what happened to Niels Jensen, but Ole Henriksen [1] started a business that designs technology for prefab "pod" houses, and Mogens Glad [2] became a movie producer.