- BTEC National Diploma in Geographical Information Systems, 1997, Kingston College, London, United Kingdom
- Certificate in Cartography and Draughting, 1993, Gaborone, Botswana
- Certificate in Surveying and Levelling, 1993, Tswelelopele Brigades, Ramotswa
Modisa was born in Gaborone and attended Primary and Secondary School in Gaborone. He went for his National Service in Ramotswa. On completion of National Service he joined the Department of Town and Regional Planning a Trainee.
He joined the University of Botswana in 2001 as a Cartographer in the Geology Department, Faculty of Science. He then joined the History Department in 2003. He has previously worked as a G.I.S Specialist at Wellfield Consulting Services, a locally based Water Resources Engineering Consulting Firm (1999-2001) and at the Department Town and Regional Planning in the then Ministry of Local Government Lands and Housing (1994-1999).
He has attended workshops organised by the EDDI Project in
- Spatial Analysis (Creating & Managing the Geodatabase,
- Introduction to ARCGIS I
- Introduction to GIS II
- GIS and Remote Sensing as applied to Geology and Hydrogeology
He has also attended on
- Dynamic Knowledgebase and Dynamic Maps
a Training Workshop organised by the Food and Agricultural Organisation of the United Nations, Harare, Zimbabwe