As you asking here I am telling Dinesh Kumar Sarraf is Chairman & Managing Director (CMD) at Oil and Natural Gas Corporation Limited (ONGC) , here is contact address

Dinesh Kumar Sarraf
ONGC: Registered Office
Jeevan Bharti, Tower –II, 124 Indira Chowk
New Delhi – 110001
EPABX No.: 2330100 (30 lines DID Facility)
23310156,23721756
Fax No.: 011- 23316413
23323402
23315607
23313028 (Fax)

Other key person :

Shashi Shanker
Director (Technology & Field Services) 23314514
23713743 (Fax)

Tapas Kumar Sengupta
Director (Offshore) 23314599
23721761 (Fax)

Desh Deepak Misra
Director (Human Resource)
23314610
23737971 (Fax)

Ajay K Dwivedi
Director (Exploration)
23314549
23312012 (Fax)

Ved Prakash Mahawar
Director (Onshore) 23314552
23725369 (Fax)

A K Srinivasan
Director (Finance)
23737973
23766541 (Fax)

N K Verma
Managing Director,

ONGC Videsh Invitee
23713790
23730369 (Fax)

A. P. Sawhney
Additional Secretary, Ministry of Petroleum & Natural Gas, ----

U P Singh
Additional Secretary
(Exploration), MoP&NG ----

K Narasimha Murthy
Independent Director ----

Ajai Malhotra
Independent Director ----

Prof. Shireesh B. Kedare
Independent Director ----

K.M. Padmanabhan
Independent Director ----

Dr A. K. Ambasht
CVO 23705463
23312608 (Fax)

V N Murthy Company Secretary 23323201
23311326 (Fax)