Teachers have been identified as one of the most important inputs to the education system with a greater responsibility of implementing education policies and programmes which lead to manpower development. The efficient management and utilization of this resource remains critical to the quality of learning outcomes in the education system. Targeted efforts in the past two decades have proven futile in improving the terms and conditions of work for most Kenyan teachers in the public education sector. This book intends to bring to the fore an in-depth understanding and empirically determine teacher motivational level and its influence on student academic performance in public day secondary schools in Nairobi County, Kenya. The study is grounded on Fredrick Hertzberg's Two-Factor theory which provides a set of ideas on motivation among others. The analysis provides valuable information on teacher motivation to learning institutions, principals, teachers, the Teacher's Service Commission and the Ministry of Education (Kenya) and may be used for corrective measures to improve teacher engagement and student academic performance.