1. Rev N. I. Ude 1994- 1996

2. Mr. Emmanuel O. Onwe 1996-2001

3. Mr. Nwite Patrick (Acting principal) ( May 2001- August 2001)

4. Rev. Onwe Ignatius (September 2001-August 2002)

5. Rev. Joseph Nwibo (September 2002-August 2003)

6. Rev. N. I. Ude (September 2003-August 2009)

7. Rev. J. A. Ebeke (September 2009-August 2015)

8. Rev. N. I. Ude (September 2015 till date)

Oikonomos Foundation, a Dutch based Christian donor in 1997 through Rev G.Clements came to empower the church in personnel; technical knowhow, finance and infrastructure to enable the church actualize her purpose. With the coming of the Dutch based Christian donor Oikonomos Foundation a proposal for infrastructural development plan for John Calvin Secondary school was developed and sent to Donor to get the approval for possible implementation of the infrastructural development. The infrastructural development comprised of an administrative block, classroom blocks, a laboratory, a library and an examination hall. The proposal was approved by Oikonomos Foundation. Consequent upon the approval of the infrastructural development the first six class room block, administrative block, examination hall were built along with a laboratory between 1998 and 1999. The building of the above mentioned infrastructure qualifies the school to be registered with the two eternal examination bodies in Nigeria namely West African Examination Council (WAEC) and National Examination Council (NECO) in 2002 under the principal ship of Rev. I.N. Onwe. When Oikonomos Foundation saw that the aim of the church concerning the school was not forthcoming as expected despite the effort the church put in the school the donor sponsored an evaluation of the school activities in 2002 to diagnose the problem and recommend possible means of re-addressing the needs. The evaluation was carried out by CRUDAN. Following the recommendation for more classroom accommodation another six classroom block was built between 2003 and 2004. In a bid to achieve academic excellence in John Calvin Secondary School Oikonomos Foundation sponsored another evaluation in 2006.Based on the report of the 2006 assessment vocational center was integrated with the school system. The vocational center started operation with the following departments: Tailoring, Leather work, Hair dressing, wood work and computer. At that moment 40 computers were bought for student computer lesson. In 2007 the donor bought 20KVA generator to boost power supply in the school. In 2012/2013 the examination hall was extended which was completed in 2016/2017.

In 20016 100 computers were bought for students computer classes with a befitting and well articulated and ventilated computer laboratory which guarantee effective computer lessons .At present John Calvin Secondary School Oswanka has outstanding infrastructures which include: an administrative block which comprises six office accommodation, a conference hall and examination hall down stairs and two computer laboratories and one more office accommodation up stairs,17 standard class room blocks, school library equipped with current and relevant academic books, well equipped science laboratories with a special laboratory equipment called ECOLAB(Ecological laboratory) used to carry out all kinds of science experiments. The ECOLAB materials were imported from Peru. The school also has a mini-staff quarters which is accommodating some staff members. In personnel the school has also developed greatly see the list of staff and their qualification on page.