It’s not often that you hear of large banks changing their CEOs. OCBC Ltd (SGX: O39), one of Singapore’s three big banks, surprised investors last week when it announced that its current CEO, Samuel Tsien, will be retiring in mid-April. Succeeding him will be Ms Helen Wong, 59, who has many years of banking experience in China and North Asia. Ms Wong had a long history with OCBC, joining the bank way back in 1984 as its first China desk manager. She has worked in various roles in investment banking, corporate banking, relationship management and debt capital markets since then. Her last role was at HSBC Holdings (LON: HSBA) where she was appointed chief executive of Greater China. Ms Wong rejoined OCBC in February last year and helped to review and redefine OCBC’s group strategy and operating model. She also spearheaded a task force that worked on the bank’s sustainability efforts....