Mtolera has a passion for Customs law. He taught tax law at the Institute of Tax Administration and Adhi University for 12 years from 2010.
Nicholas is an expert in clearing and forwarding. He has held various managerial positions with clearing and forwarding companies. He worked with the Ministry of Education as a teacher and crossed from teaching to become a renowned clearing and freight forwarder expert. He started at a low level as a Declaration and Documentation clerk at Kangaroo Ltd before he rose to the position of Manager Declaration & Customs Consultant with Freight Forwarders Ltd. He holds a certificate in handling dangerous goods which was offered by IATA/Swissport in Dar es Salaam. He also studied at the Institute of Tax Administration and was awarded with a certificate in customs clearing and forwarding.