Katie and Kevin Tsang met in in 2008 while studying at the Chinese University of Hong Kong. Since then they have lived on three different continents and travelled to over 40 countries together.

Kevin was born in Copenhagen and grew up in Atlanta, Georgia. Some of Sam Wu's experiences are based on Kevin's childhood.

Katie was born and raised in Southern California. She has previously worked at Booktrust and also writes YA as Katherine Webber.

Katie and Kevin currently live in London. Sam Wu is NOT Afraid of Sharks is the second book they have written together.