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. He joined legal and Corporate Advocates Law firm in 2011, Where he was involved in handling high-profile tax advisory and complex litigation matters. He then set up Himet Advocates in 2016 which has quickly to become one of a premier tax law firm in Tanzania. When it comes to tax advisory, consultation and representation, Mtolera is greatly acknowledged by local and multinational companies as well as his peers. He specializes in tax dispute resolution, tax advising and tax structuring. His background as an academic, his experience as Advocate, have made Mr. Mtolera one of the leading tax lawyers in Tanzania.