Loeb later taught at Harvard, where he was senior lecturer in the Visual and Environmental Studies Department.
His language, which he described as "Visual Mathematics" and "Design Science," led to lifelong collaboration with innovators such as R. Buckminster Fuller and M.C.
Loeb was a founder and first Vice-President of the International Society for the Interdisciplinary Study of Symmetry (ISIS-Symmetry).
Loeb and his wife, Charlotte Aarts Loeb (1921–2006) lived for many years in Cambridge, Massachusetts, and maintained a music room where they played Renaissance music, often with period instruments, and practiced Renaissance dance.
[1] He is buried at Mount Auburn Cemetery in Cambridge, Massachusetts, and his grave contains the inscription "Beloved teacher, scientist & musician."