 My name is Ajinkya Kumar Datta and I am an associate professor in the department of chemistry IIT Bombay. This course is about many body methods in quantum chemistry. We teach this course under the name CH 560 in our department. The participants are final year student in our 4 year BS program and 2 years MSC program. This course is intended for MSC and PhD student who are performing quantum chemistry calculation or want to do quantum chemistry calculation to solve chemistry problems as well as people who are interested in the details of interactions in atoms and molecules. Me and my colleague Professor Saurav Pal from Ashoka University is going to teach this course together. You are expected to have basic understanding of quantum mechanics to participate in the course, but do not get afraid in this course we are going to derive all the concept from the scratch. So, we will start from the postulates of quantum mechanics and Schrodinger equation. We are going to know about the variation theorem and we are going to use this variation theorem to derive Hartree-Fock self consistent field equations. We are going to know about Slater and Gaussian basis sets and how to construct them. We are going to know about density and population analysis how to interpret Hartree-Fock results. We are going to know what are the deficiencies in a Hartree-Fock method and going to come into the concept of what is called an electron correlation. We are going to see two alternative approach for solving electron correlation. One is variationally using configuration interaction and the second one is perturbationally using many body perturbation theory. We are going to see what are the deficiencies in these two approaches and finally, we are going to learn about pair correlation theory and the couple cluster method which is considered as the gold standard of quantum chemistry. So, we hope that participating in this course is going to be beneficial to you and you are going to learn about the concepts of many body quantum chemistry which perhaps you have not learned in your earlier classes. So, we are hoping to see you in the class. Thank you.