A 34-year-old who was allegedly kicked out of a suburban wine bar on Sydney's north shore before launching a stabbing attack on a group of teenagers was a postgraduate science lecturer at the University of NSW.

Until last week, Shannon Brett Morrison was working as a project manager at a pharmaceutical company PSI CRO and as a lecturer and tutor in the UNSW School of Medicine.

Shannon Brett Morrison, 34, has been charged with attempted murder after he allegedly stabbed six teenagers in a park on Sydney's north shore.

Described online by colleagues as "approachable," "humble" and "a pleasure to work with," Mr Morrison holds a Masters in Pharmaceutical Medicine from UNSW, as well as a Bachelor of Advanced Science from the University of Sydney.

But now the 34-year-old stands accused of attempted murder, after an alleged stabbing spree last weekend in which he allegedly attacked six teenagers with a knife in a Turramurra park.