Arun was the founder and Chief Operating Officer of the India Today Group’s  online venture and was instrumental in setting up their online global syndication business. He later moved on to become the station director for the country's first 24 hour private FM radio station, Radio City (Indian radio station)  and then became Vice President, Operations, of Microland's technical support business. In 2005 he led a start up as CEO called SEraja funded by entrepreneur Rajesh Jain that addressed the media-centric management of events using the Internet and mobile phones. Esther Dyson's Quarterly Report on digital technology, Release 1.0, described SEraja as "perhaps the most ambitious events project" they had come across. SEraja was the brain child of Ramesh Jain, Donald Bren Professor in Information and Computer Sciences at the University of California, Irvine and the founder of IEEE MultiMedia. SEraja failed to create the ambitious EventWeb it had set out to build. In 2007, the project had to be shut down. Arun continues to pursue his interest in researching and writing about technology. He was part of the research and documentation team of the Karnataka Information and Technology Group 2020 (KIG 2020) constituted by the Government of Karnataka, India, in 2012 whose objective was to provide recommendations refocusing the state's goals in information technology.
Arun has produced a rock album for CBS and has authored a book for Harper Collins Publishers—Bombay A Contemporary Account of Mumbai. He attended St. Xavier's College, Mumbai from 1977 to 1981 and was listed under "Alumni of Distinction from St Xavier's College, Bombay"  in 2006.
He continues to write for a variety of publications and has been invited by UN Habitat to present his thinking in the area of urbanization and the environment.
- "Success in one business does not automatically lead to success on the Net". Agencyfaqs. 2001-01-11. Retrieved 2010-10-27.
- "Former Radio City Arun Katiyar joins Microland". Exchange4Media. 2004-04-14. Retrieved 2010-05-22.
- "Seraja plans mobile alerts on city events". The Hindu Business Line. 2006-05-19. Retrieved 2010-05-24.
- "Esther Dyson's Quarterly Report Release 1.0, Volume 24, No 2, December 2005". Esther Dyson. 2005-12-01. Retrieved 2010-05-24.
- "President's Note". TiE Bangalore. 2013-01-21. Retrieved 2013-08-11.
- "Karnataka Information Communication Technology Group 2012 Report". KIG 2020. 2013-01-08. Retrieved 2013-08-11.
- "Skyscrapers and slums. Book review: N. Bhojani and A. Katiyar's 'Bombay: A Contemporary Account' by Manjula Padmanabhan". India Today Group. 1996-09-30. Retrieved 2013-08-07.
- "Some of our important Alumni (St. Xavier's Alumni/ae of Distinction)". Xavier's Development Project Consultants Emily Andrade and Andrea Quadros. 2006-04-03. Retrieved 2012-08-29.
- "A Spin Through the Blue Hills". DNA. 2012-12-21. Retrieved 2012-12-21.
- "Pedalling up the value chain". Business Standard. 2009-04-03. Retrieved 2010-05-24.
- "Cycling: Arun Katiyar at TEDxNMIMSBangalore". TED. 2013-04-11. Retrieved 2013-04-15.
- "The 5th Asian City Journalist Conference, Urbanization Problems in Asia ~ Improving Living Environment and Natural Environment, organized by the UN-HABITAT Fukuoka Office and the Ministry of Land, Infrastructure, Transport and Tourism , Government of Japan.". KCAP, UN-Habitat. 2011-01-13. Retrieved 2011-03-21.
- Extract from "Bombay - A Contemporary Account of Mumbai" by Namas Bhojani and Arun Katiyar, Harper Collins, 1996
- Podcast on The Kamla Bhatt Show on SEraja and its technology, June 2006
- Noted by Shanghai Daily for presentation at conference organized by the UN-HABITAT Japan office to discuss problems of deteriorating environment caused by urbanization, 19 January, 2011
- Directory of column for DNA newspaper, 2009-2011
- Directory of business commentaries for Business World, 2011 onwards
- Directory of contributions to Mint & The Wall Street Journal
- Directory of contributions to Own-It/ University of the Arts London