Because Heart had a knack for spotting engineers who could make things happen, the groups he had supervised at Lincoln tended to be unusually productive.

[6]In 1966, Heart left Lincoln Lab after being recruited by research and development company Bolt, Beranek and Newman (BBN).

[7] In August 1968, BBN won a request for proposal from ARPA to build the first Interface Message Processor (IMP), a computer that transmitted data and interconnected a network known today as a router.

[10] By September 6, 1968, Heart's team finalized the nearly 200-page, $100,000 IMP proposal, which was BBN's most expensive project to date.

"[13] Influenced by working at Lincoln Lab for Jay Forrester, the inventor of core memory, Heart prioritized reliability over cost, performance, or other factors, being "a most defensive driver when it came to engineering.

While working at Lincoln Laboratory, Heart met Jane Sundgaard, one of the company's first women programmers.

[18] On June 24, 2018, Frank Heart died of melanoma at age 89 in a retirement community in Lexington, Massachusetts.