e. After Sreedharan's retirement, Mangu Singh, the current director of Delhi Metro, took over the reins after his retirement on 31 December 2011.

Mangu Singh was born in Najeebabad, Uttar Pradesh and at an early age he developed a curiosity for mathematics and science. Although Mangu Singh had his early education in a small town with inadequate educational facilities and resources, he never gave up on the future.

He expected big as he worked tirelessly to secure his place in one of the most prestigious universities in the country, the University of Roorkee, now known as the Indian Institute of Technology Roorkee.

In 1979, Mangu Singh was awarded a degree in Civil Engineering from the University of Roorkee with the best academic results, followed by a Master's degree in Sustainable Development.

Success will come to those who work hard to succeed. While a student, Mangu Singh was able to develop an interest in joining the public sector and helping the society.

This was due to Mangu Singh's desire to improve the quality of life of Indian citizens, which led Mangu Singh to appear for the Union Public Service Commission examination in 1981. After passing the exam, Mangu Singh joined the Indian Railway Service as Engineers in 1983.

While working for the organization, Mangu Singh held various roles in the following departments: procurement, planning, as well as operations.

Mangu Singh served as the Deputy Chief Engineer of the Kolkata Metro Railway during the years 1989-96, during which he not only contributed significantly to the development of the Kolkata Metro but also brought about radical changes in metro engineering projects across the country, including Mumbai. Chennai, Hyderabad and Bangalore.

It was in 1997 that Mangu Singh was appointed to the Delhi Metro Rail Corporation at its inception and since then has played an integral role in setting up the Delhi Metro line.

Mangu Singh is also the head of several projects under Delhi Metro including Clean Development Mechanism projects. In recognition of his dedication and perseverance in the successful implementation of the Kolkata Metro, Mangu Singh was awarded the National Railway Week Award in 1996.

In addition, he was awarded a distinguished award as an alumnus at the Global Meet Indian Institute of Technology Roorkee in 2007 as a role model for graduates from Indian Institute of Technology Roorkee.

In recognition of his extensive knowledge in underground construction, Mangu Singh was awarded The Engineer of the Year prize by the Indian Institution of Engineers in 2012 and is recognized as one of the best engineers in India today.

Mangu Singh's life story is an inspiration not only to engineers everywhere but to everyone in life. Everyone can achieve success in life if they work to the best of their ability.

Mangu Singh hails from a small town who cannot limit the scope of his ambitions. Success is for those who are brave enough to face challenges in life.

Mangu Singh has worked on metro related projects that are very new to their Indian context. There is risk in implementing something new, as it is impossible to be certain about its results and success rate.

However, he cannot succeed until he tries. This is important knowledge that everyone should be taught by Mangu Singh.