OgilvyOne was also unable to disclose Tsui's next move.
Tsui joined Ogilvy in 2006 as regional managing director of Neo@Ogilvy Asia-Pacific. She then helmed the digital arm for more than six years as regional president, until she was promoted last January to the post of regional vice-president and COO for OgilvyOne Worldwide Asia-Pacific.
Tsui could not be reached in time for publication.