| Description |
|---|
|
|---|
| Trustee, Kenya Revenue Authority Staff Pension Scheme (2001 - 2007) |
| Head of Research, Kenya School of Revenue Administration (June 2017-February 2019) |
| Head of Quality Assurance and Risk, Kenya School of Revenue Administration, KRA (March 2015-June 2016) |
| Member and Chairman, Supervisory Committee, Hazina SACCO Society Ltd (1996-2001) |
| Founding Patron, St. Augustine Ogeda Secondary School, Siaya County, Kenya (2009-2016) |
| Regional Trainer, Eastern and Southern Africa, World Customs Organization (2015-2018) |
| Member, Technical Committee for Research: African Tax Administration Forum, Pretoria, RSA (2018-) |
| Tax Assessor, Kenya Revenue Authority (1991-2019) |
| Founder and Managing Editor, African Tax and Customs Review (ATCR), a Continental journal of Tax, Customs and Fiscal Policy |
| Editor (2011-2015), African Journal of Business Management (AJBM), based in Pretoria, South Africa |
| Editor, Journal of Accounting and Taxation (JAT) |
| Editor, Oriental Journals |
| Listed among the Top 100 Most Cited Scientists in Kenya (Google Scholar Citations, European Commission, Project Acumen, 15th March, 2015). |
| Founding Member of the Board of Directors, ICPAK Centre for Public Finance and Tax (CPFT) |
| Head of Postgraduate Studies, Kenya School of Revenue Administration, KRA in collaboration with Moi University and JKUAT (June 2016-June 2017) |
| Among the Most Cited Scholars in Kenya in the areas of Business, Management and Finance |
| Ranked at No.2 globally among the most cited scholars in the area of Ownership Structure |
