Allwell earned his law degree from Imo State University, Nigeria, and was called to the Nigerian Bar in 2010. He spent a year as a legal counsel in one of the country's leading law firms before leaving the practice to pursue his postgraduate education. In 2013, he graduated with a Master’s in International Business Law from the University of Central Lancashire. He then completed his PhD in Human Rights in 2017.
Allwell has presented papers at conferences in Turkey, Italy, Canada, Botswana, and the UK, amongst others. He has also published peer-reviewed articles and, more recently, a monograph. Allwell conducts research on human rights generally, and issues relating to public law, regionalism, and globalisation. He is the co-founder of Afritondo, a media and publishing platform for African literature.