Ishaka holds a Bcs (Econ) MUK, PGDmgt (Postgraduate Diploma in Business Management – UMI) and CDAF (Certified Diploma in Accounting and Finance (UK). He is currently a Director of Kam Suppliers and Contractors Ltd. An agro processing company and member of the grain council of Uganda (TGCU). Musisi is a member of the Audit Committee of TGCU. He is at the sametime Chairman of Mpigi District Local Council Public Accounts Committee (LGPAC). He is in Agri business under Mbazi Estates ltd in Mpigi District, growing coffee, oranges and mangoes.