Hjalmar Winbladh is a serial entrepreneur from Sweden

Sweden

Sweden , officially the Kingdom of Sweden , is a Nordic country on the Scandinavian Peninsula in Northern Europe. Sweden borders with Norway and Finland and is connected to Denmark by a bridge-tunnel across the Öresund....

. Today he is Chairman of Rebtel

Rebtel

Rebtel is a Mobile VoIP provider, founded in 2006 in Sweden by Hjalmar Winbladh and Jonas Lindroth. The Rebtel offices are located in Stockholm, Sweden and Luxembourg....

, which he co-founded in early 2006. His previous venture was Sendit AB, which pioneered mobile Internet services via mobile operators in 1994. He and his co-founder, Jonas Lindroth took Sendit public in Sweden in 1997. Sendit was acquired in 1999 for $128 million by Microsoft

Microsoft

Microsoft Corporation is an American public multinational corporation headquartered in Redmond, Washington, USA that develops, manufactures, licenses, and supports a wide range of products and services predominantly related to computing through its various product divisions...

where Winbladh served as general manager of Microsoft’s Mobile Internet Business Unit until 2001.

In May 2006 Hjalmar Winbladh co-founded Rebtel with Jonas Lindroth. Rebtel offers its users the chance to make low cost international mobile-to-mobile or mobile-to-landline calls.

In March 2007 Rebtel received the Red Herring 100 Europe Award.

(1) http://money.cnn.com/galleries/2007/fortune/0704/gallery.fortune_innovators.fortune/3.html
(2) http://www.ilocus.com/2007/12/interview_with_hjalmar_winblad.html