Yn wreiddiol o gefndir gwaith cymdeithasol, mae yr Athro Holland yn gweithio ar hyn o bryd yn Ysgol y Gwyddorau Cymdeithasol, Prifysgol Caerdydd, yn darlithio ym maes gwaith cymdeithasol ac astudiaethau plentyndod ar lefel is-raddedig, Meistr a Doethuriaeth.  Mae ganddi enw da yn rhyngwladol, gan iddi alluogi plant a phobl ifanc i gyflwyno eu safbwyntiau trwy waith ymchwil cyfranogol.  Yr Athro Holland yw Cyfarwyddwr a sylfaenydd CASCADE (Canolfan Ymchwil Gofal Cymdeithasol Plant). Mae’r Ganolfan, sy'n cynnwys CASCADE Voices, yn rhoi cyfle i bobl ifanc fu mewn gofal graffu ar flaenoriaethau CASCADE. Hefyd, mae ganddi enw da iawn am ei gwaith ysgrifennu, ei gwaith ymchwil a'i siarad cyhoeddus am faterion plant.  Mae ei meysydd arbenigedd yn cynnwys hawliau plant, safbwyntiau plant Cymru am ddinasyddiaeth a hunaniaeth, plant sy'n derbyn gofal, amddiffyn plant, a mabwysiadu. Mae hi hefyd wedi ymgyrchu dros, ac ymchwilio i, anghenion a hawliau plant.
Coming originally from a social work background, Professor Holland currently works at the School of Social Sciences at Cardiff University teaching social work and childhood studies at undergraduate, Masters and Doctorate levels and has an international reputation built on enabling children and young people to represent their own views through participative research methods. Professor Holland is the Director and founder of CASCADE (Children’s Social Care Research Centre).  The Centre includes CASCADE Voices, which enables young people who have experienced care to scrutinise CASCADE’s priorities. In addition, she has a strong reputation for her writing, research and public speaking about children's issues.  Her areas of expertise include children's rights, Welsh children’s views about citizenship and identity, looked after children, child protection and adoption.  She has also campaigned for and researched the needs and rights of children.