Coloma started working as editor of the Far East Bank and Trust Co.'s bank publication in March 1974. He served as Vice president of the same bank from 1982 to 1988. By June 1998 he started working at
Asian Institute of Management as a professor. He has taken five work leaves from AIM to work for the government. He first served as undersecretary of
Department of Agrarian Reform. Then from 1989 to 1991 he served as undersecretary of
Department of Transportation and Communications. He also served as the head of the
Presidential Management Staff from 1990 to 1991 under President
Cory Aquino. Coloma briefly served as president of North Luzon Railways Corporation and then served as undersecretary of DOTC under President
Joseph Estrada from 1998 to 2000. From 2010 until 2016 Coloma served as
Secretary of Presidential Communications Operations which replaces the Office of Press Secretary. In 2012, Coloma received the Quadricentennial Service Award from
University of Santo Tomas for his important role in the 400th founding anniversary of the university. After
Civil Service Commission chairperson
Francisco Duque III stepped down last September 2015, Coloma was considered to succeed as chair of CSC. Coloma however chose to decline the offer to be appointed as CSC chairperson, and stayed in his post as PCOO Secretary. Coloma also served several private companies. From 1996 to 2008 he is a Director of Transnational Diversified Group where he also served as Division President and Group Chief Learning Officer from 2004 to 2008. From 2005 he is a Director of Loyola Plans Consolidated, Inc. He also served as Management consultant of various organizations including
USAID (1990),
PricewaterhouseCoopers (1991–2000),
Canadian International Development Agency (circa 1995),
Land Bank of the Philippines (1992–1998),
Asian Development Bank (2005–2006), and
Philippine National Bank (2007). He was president of the People Management Association of the Philippines in 1988. ==References==