Born on 13th March, 1960. Passed S.S.C. with 68% marks in the year 1975, B.Sc. with 68% from M.G.Science College, Ahmedabad in the year 1979 and M.Sc. with Organic Chemistry from University School of Science in the year 1981. He did his LL.B. degree in the year 1984 with first class and LL.M. with First Rank in the First class in the year 1986 from L.A. Shah Law College, Ahmedabad.
He got two Gold medals, one of Principal M.S. Pandit Gold Medal and another from Bombay Hindu Law Research and Reform Association. He was a National Scholar in the year 1983-84 and 1984-85.
He enrolled as an Advocate on 28th July, 1984 and practiced at the High Court of Gujarat. He practiced in Civil, Criminal and Constitutional matters as well as Excise and Custom matters on behalf of Union of India at the High Court of Gujarat. He was appointed as a Special Counsel of the State of Gujarat in other High Courts.
He was a panel advocate of various Institutions/Authorities like Gujarat Public Service Commission (GPSC), Ahmedabad Urban Development Authority (AUDA), Ahmedabad District Panchayat, Provident Fund Commissioner, BSNL, AICTE, New Delhi etc. in the High Court of Gujarat. He was also a counsel on behalf of State of Maharashtra at the High Court of Gujarat.
He served as part-time lecturer in Sir L.A.Shah Law College, Ahmedabad for 9 years, both at LL.B. and LL.M. Level.
He was appointed as Additional Central Government Standing Counsel by the Union of India, in the year 1999 and as Senior Central Government Standing Counsel by Central Government for High Court of Gujarat on 5th July, 2001.
He was elevated as an Additional Judge of the High Court of Gujarat on 7th March, 2004 and took oath as permanent Judge of High Court of Gujarat on 25th January, 2006
On transfer, he took oath as Judge of the High Court of Jharkhand, Ranchi on 3rd February, 2009.
Appointed as Executive Chairman of Jharkhand State Legal Services Authority from August, 2012.
Appointed as Acting Chief Justice of the High Court of Jharkhand from 4th August 2013 to 15th November 2013 and from 13th August, 2014 to 31st October, 2014.
Appointed as Chairman of Search Committee in the month of June & July, 2013 for appointment of Vice Chancellors of Kolhan University; Nilamber Pitamber University; Vinoba Bhave University; Siddhu Kanhu Murmu University and Vinoba Bhave University for Pro Vice Chancellor.
Hon’ble Mr. Justice D.N. Patel has also been nominated as:
• Member of General Body of National Judicial Academy, Bhopal (M.P.)
• Member of Central Authority (NALSA) vide Notification dated 4th February, 2016
• Members of the "Committee for sensitization of Family Court Matters"
• Re-nominated as Ex-officio Member of Central Authority (NALSA) vide Notification dated 5th April, 2018
Appointed as Acting Chief Justice of the High Court of Jharkhand from 10th of June 2017 to 10th August, 2018.
Appointed as Acting Chief Justice of the High Court of Jharkhand from 24th of May 2019 to 6th June, 2019.
Appointed as Chief Justice of Delhi High Court on 7th June, 2019.