The Team
GSA Organisational Chart
(Adobe PDF File)

Nastashia Buck

Chief Executive Officer

Bio: Nastashia brings to GSA extensive experience in leadership positions within both the Insurance Industry and Sports Administration. She holds qualifications in Allied Health, Personal Injury Management and formalised Training and Assessing. Nastashia’s critical and solution orientated thinking has helped fuel growth, innovation and excellence within her previous roles. Nastashia is a team oriented leader who values empowering and supporting those around her. Nastashia's personal experience with Gymnastics in South Australia and additionally with other state associations will be utilised to create ongoing community engagement and support.


Chelsea Wilkinson

Operations Manager

Bio: Chelsea comes from a gymnastics background and 10 years’ experience working in the Recreation and Fitness Industry, having completed a Bachelor of Applied Science in Recreation Planning and Management and Certificate 3 in Fitness. Her passion for the industry is evident through her approachable and friendly manner.

Finance and Administration 

Marketing and Communications 

Rebekah Ninnis
Marketing and Communications Manager

Bio: Rebekah is a passionate and dynamic marketer and brings to GSA well over a decade of experience working with iconic South Australian brands. She is a results oriented, outcome focussed ‘people person’ who leads by example. Rebekah holds a Bachelor of Management (Marketing) degree, and has extensive experience in developing and implementing strategic marketing campaigns and a strong interest in digital marketing. 


Event and Sport 

Darrin Rigby

Event and Sport Coordinator

Bio: Darrin comes to Gymnastics SA as a small business owner, and a volunteer coordinator for Triathlon SA. Darrin is a senior Technical Official with Triathlon Australia, with experience at national and international events. With a wife and two girls, sport is embedded in the household with swimming, softball and trampoline (and cycling and running when there’s time). In his spare time he is completing a Bachelor of Business (Sports Management) at Deakin University.

Thamsin Sharrad
Event Officer

Bio: Thamsin comes to Gymnastics SA after completing her Bachelor of Business (Sport and Recreation Management) at University of South Australia. She is additionally a qualified Kindergym coach and her working background originates from the YMCA (Marion Leisure and Fitness Centre & Glengowrie) and Netball. Her bubbly and friendly personality will be a great asset to the organisation.

Education and Workforce 


Tammy Johnson
Education and Workforce Coordinator

Bio: Tammy is an energetic and dynamic presenter, assessor, moderator, coach and therapist, with many years of experience in Gymnastics & Science. She has presented over 20 Academies for the International Gymnastics Federation (FIG) around the world in various Gymsports. She was a gymnast on the National Team for South Africa in Artistic Gymnastics and Aerobic Gymnastics and was a finalist in several World Championship events for Aerobic Gymnastics. She is currently on the International Gymnastics Federation (FIG) Working Group for Aerobic Gymnastics.

Brenton Dicker
Education and Accreditation Officer

Bio: Brenton is a current Advanced MAG, WAG, GfA and Tumbling coach and also presents in the TeamGym and Free G workshops. Brenton is one of our current presenter and assessors and travels interstate often to share his knowledge and is very enthusiastic about helping and growing our current and new coaches and clubs.

Club Development 

Heather Mooney
KinderGym Development and Accreditation Officer

Raelene Osborn
KinderGym Development and Accreditation Officer

Bio:  Raelene has been involved in gymnastics since the late 1990's when her husband and two children joined their local club. Raelene was pivotal in establishing the KinderGym at Henley Beach and has been involved in the University of South Australia KinderGym Project for 10 years. Her passion for KinderGym is demonstrated by receiving the Horrie Riddle Scholarship, KinderGym Leader of the Year for both South Australia and National and Life Membership of GSA. Raelene has a KinderGym Advanced plus GFA Intermediate accreditation and is a Course Presenter.

High Performance 

Paul Szyjko

Yu Bo


Sarah Hopkins

Viktor Zhuravlev

Cassie Hoare

Chris Hoare

Maddi Ross