Joo has extensive experience as a specialist obstetrician and gynaecologist in the UK. He is also a UK sub-specialist in reproductive medicine and fertility; he was appointed to complete this sub-specialist program of the UK Royal College via a highly competitive national selection. While in the UK, Joo was also the chairperson for the national trainees in reproductive medicine and fertility.

Joo always strives to be the best obstetrician to provide mums-to-be the highest quality pregnancy care and a tailored birth plan. He has a special interest in high-risk pregnancies and in looking after obstetrics patients in their pregnancies after fertility assistance. He is one of the only obstetricians who is credentialed to deliver privately at King Edward Hospital for babies eager to arrive earlier. Although Joo has a considerable experience in performing Caesarean sections, including technically complicated cases, he strongly believes women aiming to have natural births should be given the maximal chances to achieve vaginal births safely.

Joo was a research scientist in reproductive medicine; his doctoral research in reproductive immunology has led to the award of Doctor of Medicine from the University of Glasgow. He has presented internationally, and has won several prizes for his research work. He also has a Master of Science in Clinical Trials from the University of London. He has written a chapter in the book on the ‘Clinical Management of Pregnancies Following Fertility Treatment’. 

Joo is a regular contributor to articles related to women's health, fertility and obstetrics internationally. He has been interviewed by the New York Times on the availability of fertility services in countries with limited resources. He has also published a Fertility and Pregnancy Cookbook. He has his own YouTube channel for updating the public on the latest developments in obstetric and fertility care.

Joo relocated with his family to Perth, Australia in early 2015 when he was headhunted by a reputable private hospital. He prides himself in providing personalised, patient-centred care and support. He continues his research interest in fertility, obstetrics and gynaecology in Australia.

Joo delivers and consults at St John of God Subiaco Hospital.

“A good doctor pays great attention to detail before, during and after seeing each patient. It is not about rushing them through the conveyor belt.” - Dr Joo Teoh.