Energy and sustainability software provider Envizi continues its expansion with two new appointments this year, one in the US and one at home in Sydney.

Pablo Päster has been appointment in a senior role after a stint at Verisae, formerly Hara, in somewhat of a coup for Envizi.

Päster previously ran a column in Treehugger called “Ask Pablo”, which featured an interesting series of practical questions and answers on energy and sustainability issues.

His new role is vice president Solutions and Services, which will involve working with partners to develop software that meets their needs.

The appointment brings to four the number of staff in the US office, located in San Francisco.

In Australia Alistair Fraser has joined the company from Siemens. His expertise is in building energy optimisation, taking local staff numbers to around 50.