Peter "Pirre" Wallenberg Sr. (29 May 1926 – 19 January 2015) was a Swedish business leader who was chairman of Investor AB for ten years. Early life and education Wallenberg was born in Skeppsholm Parish, Stockholm, Sweden, into the Wallenberg finance family. He was the son of banker Marcus Wallenberg Jr. and his Scottish wife Dorothy (née Mackay), the younger brother of Marc Wallenberg and the nephew of Jacob Wallenberg. He earned a Candidate of Law degree in 1949 from Stockholm College, now Stockholm University. Career He began his career in 1953 at Atlas Copco AB. Wallenberg worked at its subsidiary in the United States from 1956 to 1959 and was CEO of its subsidiary in Rhodesia from 1959 to 1962 and in Congo from 1960 to 1962 and in England from 1962 to 1967. He was CEO of Atlas Copco MCT AB (Mining and Construction Technique) in Stockholm from 1968 to 1970 and Vice CEO of Atlas Copco AB from 1970 to 1974. Wallenberg was industrial advisor to the Skandinaviska Enskilda Banken (SEB) from 1974. For a long time he stood in the shadow of his father, who made his oldest son Marc his apprentice and doubted his youngest son Peter's abilities. Only in 1982, after his father's death, did he become a prominent member of the Wallenberg clan. After his father's death, Peter Wallenberg bought out Volvo's shares in two family businesses and merged the three family investment firms, Investor AB, Providentia and Export Invest. He served as chairman of Investor AB for ten years, during which time he internationalised the firm and set in motion international mergers that created companies such as ABB, AstraZeneca and Stora Enso. Wallenberg was in the mid-1980s a board member of Atlas Copco AB, AB SKF, Investor AB, Förvaltnings AB Providentia, Knut and Alice Wallenberg Foundation, AB Papyrus, Nymölla AB, Fastighets AB Stockholm-Saltsjön, Enskilda Securities in England and the International Chamber of Commerce – Budget Commission and Finance Committee. He was first vice chairman of Skandinaviska Enskilda Banken, vice chairman of ASEA, Broströms Rederi AB, AB Electrolux, Telefon AB LM Ericsson and Stora Kopparbers Bergslags AB. Wallenberg was also a board member of the Federation of Swedish Industries (Sveriges Industriförbund), the Swedish National Committee of the International Chamber of Commerce, the Stockholm School of Economics Association (from 1988 to 2001), Dillon, Read & Co. in the United States, Per Jacobsson Foundation in