She served as the head of the ACT Branch of the Australian Pharmacy Guild as well as National Vice-President of the guild. She also served on the ACT Chamber of Commerce and on the boards of charities and community organisations.
Among other positions she was: Chairman of the Canberra and Southern District Pharmacists Company Ltd (1982-1992), Vice-President of the Retail Industry and Training Council, ACT (1987-1991), Councillor at the Australian Institute of Pharmacy Management (1990-1991), Member of the ACT Board of Health (1990-1991), Member of the Pharmacy Restructuring Authority (1990-1991) and Board member of the Canberra Chamber of Commerce (1991-1992).
After winning a plurality of seats in the 1995 ACT elections, the Liberal Party formed a minority government with Carnell as Chief Minister. The government was re-elected in the 1998 election.
She held the portfolios of Minister for Health and Community Care (1995-1998), Minister Responsible for Multicultural and International Affairs (1995-2000), Minister for Business and Employment (1997-1998) and Minister for Business, Tourism and the Arts (2000).
The Coroner found in his report that the Government had turned the implosion into a 'public circus'. The public was invited by the Government to attend and witness the event, resulting in the largest crowd in Canberra's history, in excess of 100,000. The Coroner found that the Government had been cavalier in its attitude to the warnings from a health union about the possible dangers of some aspects of the proposed implosion.
The Coroner summarised that, "the evidence on this topic leads me to conclude that Carnell was poorly briefed and advised on this subject matter. The quality of the reply to the HSUA was sacrificed in the interests of speed and expediency."
In his report on the matter, Auditor-General John Parkinson found that the $27.3 million cost was estimated by Carnell, and had not undergone any assessment, review or analysis. While Carnell had factored in the $15 million in private funding for the project, no funds had been offered or provided by private companies. The Auditor-General found that, by 1998, funding for the project was being sought so rapidly that funds that had not been allocated were being spent. The ACT Auditor-General also found that an overnight loan provided by the Commonwealth Bank and signed for by Ms Carnell, for $9.7 million, was illegal.
Despite forecasting that the race series would provide the ACT economy with $52 million profit, after only 3 races were staged, the Auditor-General found that the series had in fact cost taxpayers $29 million. The Carnell Government had entered into an agreement with race organisers in which the ACT Government, and eventually ACT taxpayers, would bear all responsibility for financial risk.
When the Australian Labor Party won government and learned of the losses sustained by ACT taxpayers from this event, it cancelled the last 2 rounds of the series and settled with race organisers to keep the taxpayers from the burden of further losses which would be incurred if the race series were to continue.
== Career after politics == After resigning her post as the [[Chief Minister of the Australian Capital Territory]], Carnell was elected as a Director on the [[National Roads and Motorists' Association]] (NRMA) board of directors (2001-2002). She subsequently lost a further election for the board, thereby ceasing to be a Director. Another popularly elected member of the board resigned their post after this, which resulted in an available position on the board, to which Carnell was again appointed. It was anticipated that she would once again be defeated in a forthcoming election, resulting in her withdrawing from her position, in September 2002.{{cite web |url=http://www.smh.com.au/articles/2002/10/14/1034222683720.html |title=NRMA chief quits before big showdown - smh.com.au |format= |work= |accessdate=}} She has also held the post of Chief Executive of [[TransACT]] Development (2000-2001){{cite web |url=http://www.highbeam.com/doc/1P1-37336793.html |title=ACT: Carnell to leave politics for TransACT - AAP General News (Australia) - HighBeam Research |format= |work= |accessdate=}}, and later the positions of Chairperson, General Practice Education and Training Ltd and Executive Director, National Association of Forest Industries.{{cite web |url=http://www.abc.net.au/rn/science/earth/stories/s439410.htm |title=Earthbeat - 8/12/01: Charcoal on the South Coast |format= |work= |accessdate=}} She was appointed an [[Officer of the Order of Australia]] (AO) in the [[Australia Day]] Honours list of 2006, for her services and contributions to the [[Australian Capital Territory]].[http://www.itsanhonour.gov.au/honours/honour_roll/search.cfm?aus_award_id=1131297&search_type=quick&showInd=true It's an Honour] - Officer of the Order of Australia Nearly a decade after Ms Carnell's first marriage was dissolved, on Sunday, [[July 29]], [[2007]], Carnell and her long-term partner, Ray Kiley, married at a ceremony conducted at Old Parliament House in Canberra. Guests included local and federal politicans (both Labor and Liberal) along with a small crowd of family and friends - including Ms Carnell and Mr Kiley's children and ex-spouses. Also present was the 'former'[[Canberra Times]]'' editor Crispin Hull and former staff of the Prime Minister's office."Carnell ties the knot for a second time", ''The Canberra Times'', 30/7/2007, p3 Carnell was the Chief Executive Officer of the Australian General Practice Network in Canberra until 2008. In this role she was seen by some GPs as bringing the Divisions of General Practice too close to government, especially over her support for fundholding programs. The president of the Australian Medical Association, Dr Rosanna Capolingua, described her as "a mouthpiece for the government". She announced her resignation on 20 May 2008 to take up a position as CEO of the Australian Food and Grocery Council.{{cite web |url=http://www.6minutes.com.au/articles/z1/view.asp?id=172737 |title=Kate Carnell quits as head of divisions - www.6minutes.com.au |format= |work= |accessdate=}} {{start box}} {{s-off}} {{succession box | before=[[Trevor Kaine]] | title=[[Leader of the Opposition of the Australian Capital Territory|Opposition Leader of the Australian Capital Territory]] | years=1993–1995 | after=[[Rosemary Follett]]}} {{succession box | before=[[Rosemary Follett]] | title=[[Chief Minister of the Australian Capital Territory]] | years=1995–2000 | after=[[Gary Humphries]]}} {{end box}} {{ACTChiefMinisters}}