APT workshops in Quantum Mechanics series began with the "Genesis of Quantum Theory" on 29-30 April 2017 at Mar Ivanios College, Thiruvananthapuram. The Physics Department of Mar Ivanios College hosted the event and Dr.Jijimon K.Thomas was the coordinator. This is the first time the workshop series is being organized at Thiruvananthapuram. There were 48 participants and 13 were from Thiruvananthapuram. The original works of Wien, Planck, Einstein, Bohr, Sommerfeld and Bose were discussed in the workshop. These original derivations are rarely presented in text books. Hence the discussion was greatly helpful in constructing a holistic picture of the development of the so-called "old quantum theory".