Greg has been a professional freelance photographer since 1991. Some of his works have been featured by international companies and organizations like the Institute of South East Asian Studies, Asia Today, The Financial Times and The Japan Times and CNNiReport.
Indonesia Photo Exhibition, April 2005, Phnom Penh Cultural Center, Cambodia. Sponsored by the Indonesian Embassy.
Archipelago Photography Exhibition, November – December 2004, The Photographers Gallery, Singapore.
Supported by The Ritz-Carlton, Millenia Singapore, The Fullerton Singapore, Grand Plaza Park Royal Singapore, Swiss Club Singapore, British Association of Singapore, The Australian and New Zealand Association, Art Central Media Corp TV (Singapore), http://www.getforme.com (Singapore), http://www.clubsnap.org (Singapore), Practical Photography UK.
Photography Exhibition East of Indonesia, July 1996, Sari Pan Pacific Hotel, Jakarta. Sponsored by Freeport Indonesia.
Permanent Photography Exhibition Indonesia, since April 1995, Freeport Indonesia, Kuala Kencana Office, Timika, West Papua, Indonesia.
CNNiReport : http://ireport.cnn.com/people/GregnTrees1
Photo Gallery : https://www.ephotozine.com/user/gregntreesphotography-26020