[citation needed] Gibson began his military career in 1985 as an Army Reserve private in the West Australian University Regiment while still at high school.

In 1986 he entered the Royal Military College Duntroon and graduated serving as an Army officer for 8½ years before embarking on a career in media marketing and management.

"[15] Gibson claimed he was targeted by his colleagues for these and other progressive views,[16] which led to a nervous breakdown, resulting in him not contesting the 2015 state election.

[20] Since retiring from the Queensland Parliament, Gibson has remained active on various not-for-profit boards while continuing his advocacy and volunteer work both nationally and internationally.

[22] Gibson has also authored several articles, including "Disability, Inclusion and Democracy – an Uncomfortable Fit" and, more recently, "Queering Up the Debate: Freedom of Speech Seen Through a LGBTI Lens" in 2023.

His volunteer work has included roles in DFAT-funded aid programs, and he has chaired the committee overseeing the restructuring of CODA International for global representation.

[23] He has also had various articles published, including "Disability, Inclusion and Democracy - an Uncomfortable Fit"[24] in the journal of the Australasian Study of Parliament Group and "Queering Up the Debate: Freedom of Speech seen through a LGBTI lens".

[32] He is also a former director of Deafness Forum,[33] a national peak body representing the interests and viewpoints of the deaf, hard of hearing and deaf-blind communities, and former chair of the Queensland Chapter of the Australasian Study of Parliament Group, a non-partisan body to encourage and stimulate research, writing and teaching about parliamentary institutions in Australia to generate a better understanding of their functions.