Background
He was born in Kristiania, and spent his career in the family company P. Schreiner senior
He was born in Kristiania, and spent his career in the family company P. Schreiner senior
Company with 37 years as director He retired in 1978. He also served as board chairman of Philisophy & Company, chaired daughter companies such as Staal & Jern and Andr. He contributed with metal and steel information to Farmand and Norges Handelsog Sjøfartstidende.
He died in 1988 and was buried at Ris.
Grønneberg, was a board member of Kværner and the Royal Norwegian Yacht Club, and supervisory council member of Kreditkassen. He was a board member of Selskabet for Oslo Byes Vel from 1966, succeeded Arno Berg as chairman in 1970 and stepped down in 1978.