Küller is a founder of Rockton, a company who assists regional airlines – predominantly in Europe – by offering operating leases and innovative financing solutions. After earning an MBA in International Finance, Küller started his career in banking – first for Nordic American Banking Corporation in New York, and then at Svenska Handelsbanken. After GE Capital, he struck out on his own and built several businesses, later selling them to outside investors.
Beyond ERA he is actively engaged in other industry organisations such as ISTAT, the Aviation Club (London), the RAA and so on. Through Rockton, Küller organises and sponsors a regular event called Nord-Stat where aviation industry professionals gather to listen to speakers and exchange ideas. Rockton is a significant contributor/partner to the charitable relief organisation Airlink.