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The young student had realised medicine was not for him and, with an entrepreneurial streak that dated back to his childhood, he decided to pursue another direction.
Mr Isaacs (21) grew up in Timaru and moved to Dunedin in 2011 to study at the University of Otago.
Describing himself as a creative person, he felt medicine limited his creativity and he had no regrets about terminating his studies.
A year ago, with a friend, he started a business from very modest beginnings - they used two speakers that had been sitting in his friend's parents' garage.
Within a week, they had attracted
three bookings and that was the beginning of party hire business Gravity Events.
He now describes the business as an ''all-in-one'' events solution, covering sound, lighting, music and photography.
An LED dance floor was recently acquired, a photo booth built, and he also had a Cube - an inflatable marquee Mr Isaacs describes as a cross-between a traditional marquee and a bouncy castle.
The only real glitch in the business so far was when a client did not think to fill their generator at an event which used the Cube and it ran out of diesel and the marquee started to deflate.
Fortunately, there was some diesel nearby and the problem was quickly rectified.
Dealing with people has always been a ''big passion'' for Mr Isaacs - even at high school, he was ''buying and selling things'', trying to make some extra pocket money, so he says the business combines his interests.
Mr Isaacs has an office job during the day and while the business is still quite small, the aim is to be operating South Island-wide, in the next three to five years. He has already catered for events in Gore, Christchurch, Wanaka and Timaru.
The business no longer involved his friend, but it did involve his fiancee, Erin Roy, whom he is marrying in January.
She handles photography and is a freelance make-up artist.
Although Mr Isaacs thought his youth might mean less respect, he had found age was not such a barrier.
''I think people really like young entrepreneurs or young people doing something really cool,'' he said.
Part of the idea for Gravity stemmed from his own experience of being a student and being involved on various student committees, and having to contact different people to get services for events, instead of going to a ''one-stop-shop''.
Mr Isaacs has to juggle his fulltime job with the Gravity business, which he finds challenging.
One weekend, he worked a 50-hour straight stretch, after finishing his job at lunchtime on Friday and then being involved with various functions until midnight on the Sunday.
But Mr Isaacs said he liked the idea of taking on more than he could handle and then figuring out how to make it work.
''When it pays off, it's really awesome,'' he said.
Gravity's main target audience is corporate functions, school balls and weddings and he is keen to become involved with community groups and charities.
Being involved with the Audacious business challenge had been very worthwhile, attending seminars and tapping into the knowledge of others.
Dunedin had also proved a very supportive community, he said.