Goldman Sachs' Japan president Masanori Mochida has decided to retire at the end of the year after more than 38 years at the investment bank, according to an internal memo seen by Reuters. The internal memo dated Sunday from Goldman CEO David Solomon said Mochida will become a senior director, without mentioning who would succeed his role as president. Mochida, 68, joined Goldman Sachs in 1985 as an associate in the corporate finance department from Japan's Dai-ichi Kangyo Bank, one of the three predecessor banks of Mizuho Bank.