The time has come for top bankers to jump ship after weighing their year-end bonus cheques last month, and Citigroup is so far the first to be at the losing end. The latest to take the money and run is Wei Christianson, who has quit her post at Citigroup China Global Markets (Asia) to return to her old employer Morgan Stanley as managing director and chief executive for China in May. Ms Christianson will be based in Beijing and be responsible for overseeing and globally co-ordinating all of Morgan Stanley's business activities in China. She will also be a member of Morgan Stanley's Asia-Pacific executive committee. The mother of three will replace Jonathan Zhu, who worked on China Construction Bank's mega listing in Hong Kong last year, but is now leaving for Boston-based private equity company Bain Capital. Ms Christianson is no stranger to Morgan Stanley, where she was executive director and Beijing chief representative from 1998 to 2002 before she joined Credit Suisse First Boston as chairman and country manager for China. She joined Citigroup in October 2004, replacing Margaret Ren. Ms Christianson will only take up the reins in her new job in May, as it is understood that she only resigned a few days ago from Citigroup. The bank has a policy requiring directors and senior officials in the investment banking unit to give 75 days' notice. 'We are delighted that Wei is returning to Morgan Stanley,' said Alasdair Morrison, chairman and chief executive of Morgan Stanley Asia. 'Her appointment reinforces our commitment to our clients and to this significant growth market, and will help the firm build on the tremendous success we have had in China.' Ms Christianson is also happy to be making a comeback. 'Morgan Stanley has built an enviable track record in China. I am very pleased to be returning to the firm,' she said. 'China represents one of the world's most promising opportunities for the financial services sector,' she said. 'With the combination of Morgan Stanley's strong China platform and its deep bench of talent, I'm very excited about what we have - the capability to accomplish for our clients as China continues to produce businesses of world-class potential, as well as many outstanding new entrepreneurs.'