Herman Høgby Robertsen lea riegádan 1996:s ja lea Mossas eret. Son lea bargan Viken Bargiidbellodaga, AUF ja Bargiidbellodaga bellodatčálli politihkalaš ráđđeaddin ovdal go šattai Tonje Brenna politihkalaš ráđđeaddin borgemánus 2023. Son lea maid oanehis áiggi bargan journalistan aviissas Dagsavisen Moss Dagblad.

Høgby Robertsen lea čađahan MSc European and International Public Policy London School of Economics and Political Science oahppoásahusas, ja MA (Hons) International Relations University of St Andrews oahppoásahusas.