Theophilus Chidalu Onyejiaku is an experienced professional in data analysis and technical content writing, currently serving as a Machine Learning Technical Content Writer at Comet and a Technical Content Writer at Hit Subscribe since 2023. Additionally, Theophilus offers virtual training support in data analytics as a Data Analyst for RKY Careers and provides freelance services on Upwork, focusing on data analysis projects and content creation in topics such as Python, machine learning, and deep learning. Previously, Theophilus worked as a Data Analyst at Medbury Medical Services, contributing to sales analysis and visualization reports, and has authored over 660 articles as a Technical/Content Writer for Educative, Inc. Educational background includes a Bachelor of Engineering in Bioresources Engineering from the Federal University of Technology Owerri, Nigeria. Early experience includes an undergraduate internship at Standard General Company, engaging in water treatment, purification, and production engineering.