After completing training at the University of Cape Town in South Africa in 1983, Jelley worked in the mission hospital service, regional rural hospital service and in solo general practice in Zimbabwe.
Jelley then moved to New Zealand in 2000 and began working as a GP at Buller Hospital in 2004.
He then moved to the Bay of Plenty where he spent 12 years working as a GP in Ōhope and Whakatāne.
Jelley had been actively involved with the Eastern Bay of Plenty PHO and Primary Health Alliance and worked as a clinical advisor to planning and funding at Bay of Plenty DHB.
He had also spent some time working as a volunteer GP in the Cook Islands at Aitutaki Base Hospital.
Now based in Kerikeri, Jelley splits his time between general practice and clinical leadership with Te Tai Tokerau PHO.
During his career, Jelley had been an active supporter and mentor for aspiring Nurse Practitioners in the Bay of Plenty and Te Tai Tokerau.
He worked closely with the late Janet Mahoney, who was the first Māori Nurse Practitioner. Along with rural health, Jelley had a special interest in te ao Māori.
The Peter Snow Memorial Award was set up to honour the life and work of Dr Peter Snow who died in March 2006.
Snow was a rural general practitioner based in Tapanui.
His work contributed to the identification of chronic fatigue syndrome and he was influential in raising safety awareness on issues related to farming accidents.