With a proven track record of leadership and technical excellence, Engr. John has established himself as a seasoned expert in the design, construction, and project management of large-scale and complex projects in both Government and Private (Oil & Gas and Consultancy services) Sectors of the economy of Nigeria. He has played various leadership roles as a Project Manager in one of OML 58 Upgrade Projects operated by Total E&P Nigeria Ltd; and is presently, the Managing Director/CEO of JEFCON & ASSOCIATES LTD. He also, doubles as Project Consultant to Delta State Government on Stormwater Management and Control Measures and is holding leadership positions in his community.
Engr. Onwualu started his earlier career from NEPA (then Nigeria Electricity Power Authority) from 1991 - 1993 as a Pupil Engineer before joining Delta State Local Government Service Commission, Asaba and rose to the position of Principal Engineer from 1993-2004. He joined Total E&P Nigeria Limited, Port Harcourt as a Project Engineer and later was appointed as a Project Manager, where he successfully delivered an EPCC multi-Million Dollar project in OML 58 Upgrade Projects, Obagi, Rivers State from 2004 - 2016. He is currently serving as the Delta State Project Consultant for the study, design, and construction supervision of floodwater management and control measures in Asaba, Warri, Effurun, and environs, since 2017 to date. He has played a pivotal role in overseeing the study, design, and construction supervision of a comprehensive stormwater management and control system, transforming the region's infrastructure and enhancing the lives of its inhabitants.

John has demonstrated exceptional leadership, project management, and engineering expertise, driving innovation and improvement in his workplaces. His experience spans multiple industries, including Oil and Gas, Government, and Power Generation. He has also developed local content capacity, trained engineering personnel, and presented technical papers at engineering conferences. His outstanding contributions have been recognized with several professional awards. His commitment to building strong teams and enhancing human capital development has made him a respected figure in the engineering industry. He was awarded a Justice of Peace (JP) by the Delta State Government in 2021.