In a gazette entry, Governor General Sir Bob Dadae revoked the appointment of former secretary Mombi and appointed of Simbiken as secretary for a period of three months.
Dr Simbiken hold several professional qualifications and degrees related to the agricultural field.
He told The Post-Courier newspaper that in the coming days and months of his tenure, he would be addressing legacy issues at the department.
He said the department has been operating without proper compliance and processes to connect with the government national development goals.
"At the department level, we are supposed to provide policy and technical advice to the government of the day as well as to the sub sectors, as those sub sectors make up agriculture," Simbiken said.
"Once we do that then we can be able to link them through public investment projects. On the policy front, we ensure these investments bring returns and also ensure that the policies are able to bring in bigger investments into the country."
He said there a lot of gaps to fix and one of them is compliance and review of the funds at the department level, staff morale and departmental interconnectivity.
Over the next month, he would address the key policies of price support and freight support.