Jacobian Series — Empowering every learner, one workbook at a time. Available across West Africa and Internationally

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Our Team

THE PEOPLE BEHIND THE SERIES

Educators, authors, and advocates for mathematical confidence.

Jacobian Series is supported by qualified, certified international educators who bring expertise across multiple disciplines. Together, they ensure every workbook reflects strong pedagogy, curriculum alignment, and academic rigor.

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FOUNDER & LEAD AUTHOR

Godfred N.A. (G.N.A.) Welbeck

Certified IBDP Teacher & Head of Mathematics

Mr. Welbeck holds a Bachelor of Arts in Mathematics & Statistics from the University of Ghana, Legon, and a Post-Graduate Diploma in Education from the University of Education, Winneba. He is a Certified IB Diploma Programme teacher and currently serves as Head of Mathematics at the International School of Accra, Roman Ridge, Borstal Avenue, Accra.

His passion for mathematics education is most evident in his dedication to students who struggle with the subject. He has championed average and less-privileged learners who lose interest in mathematics during Middle and Senior High School, developing intuitive, step-by-step workbooks that rebuild confidence and ignite curiosity.

Every student can succeed in mathematics with the right guidance and resources.

This teaching philosophy is the cornerstone upon which Jacobian Series is built.

SUBJECTS TAUGHT AT ISA

International curriculum expertise.

  • Digital SAT Mathematics
  • Cambridge IGCSE Extended Mathematics (0580)
  • Cambridge IGCSE Additional Mathematics (0606)
  • Cambridge IGCSE Geography
  • IB Mathematics: Analysis & Approaches (AA) – SL & HL
  • IB Mathematics: Applications & Interpretations (AI) – SL & HL

THE JACOBIAN TEAM

Many disciplines. One standard of excellence.

AE

Mr. Ambill Essandoh

Co-Author | IBDP Physics Teacher & Research Analyst

Mr. Essandoh is a certified IB Diploma Programme Physics teacher and a Research Analyst affiliated with ResearchGate. He also serves as Learning Support Coordinator and ManageBac Administrator at the International School of Accra, managing academic records, learning support plans, and digital platforms for an optimal learning environment.

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Miss Elizabeth Naa Odoley Odoi

Co-Author | IBDP Economics & Chinese Teacher | Cambridge Coordinator

Fondly known as Miss Naa, Miss Odoi is a certified IB Diploma Programme Economics and Chinese Language teacher. As Cambridge Coordinator at the International School of Accra, she oversees the administration and delivery of Cambridge International Examinations, bringing invaluable quality assurance and global standards alignment to the authoring process.

BUILT WITH PURPOSE

Resources shaped by the classroom and made for every learner.

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