Nnaji is a strategic corporate and marketing communications, media, and brand management specialist with over a decade of experience. He is also an environmental sustainability advocate. He has professional competence in administration, advertising, climate change, and energy transition advocacy, public relations, and stakeholder engagement.

Nnaji holds a BA degree in communication and Language Arts from the University of Ibadan, Nigeria, a diploma in International Human Resources Management, and a professional certification in Strategic Brand Management and Sales and Marketing. He is an associate member of the Advertising Practitioners Council of Nigeria and a full member of the Institute of Brand Management of Nigeria. He is a certified DeserTech (Negev, Israel) Innovation Leader for the ‘Great Green Wall’.

He was formerly, Deputy National Coordinator, Nigeria for Climate Parliament, a global network of legislators working to inform and mobilize Members of Parliament and Congress to take action on the climate emergency with a focus on the MPs who are ready to exercise leadership in their parliaments on issues of climate action, energy access, large-scale renewable energy, green grids, clean cooking, and sustainable transport.

He has delivered strategic solutions to diverse programs and enhanced performance and effective project implementation at various stages.