Stockholm University: Math, Theoretical Physics, Numerical Analysis, Japanese language; Electro Technical Laboratory, Tokyo: numerical solution of eigenvalue problem for extremely large matrices;

In UK: Clinical Automation: embedded control of automated blood testing equipment, embedded software in various monitoring equipment used in hospital ICU units, Database management for Clinical Automation;

Real-time applications: many... control of radio-controlled emergency vehicles, steel work automation, embedded control of machines packing fresh produce, e.g. fresh chickens...

Software tools: wrote compilers, loaders, specialised database management systems.
Programmed main frames, minis, PCs and micro processors in various computer langages, assembly language, C, C++, Ada, SQL...

Retired: looking after the cat and learning computing I have not done very much of before like HTML 5 to CSS Grid.