A semiconductor engineer with over a decade of experience in solid state device research and industry analysis.
His Majesty has filmed a intimate address about his battle with cancer, which will be broadcast as part of this year's annual cancer awareness drive, organised by a leading cancer charity and Channel 4.
The royal household stated the King would discuss his "path to recovery" as a cancer patient, in a televised statement on Friday evening at 8pm UK time.
The address, taped inside Clarence House recently, will stress the vital significance of cancer screening checks to increase the likelihood more people catch the disease at an early stage.
This represents a rare update on the wellbeing of the King, who has been undergoing regular treatment since revealing his diagnosis in the start of 2024. But it is thought doubtful the King will specify his specific form of cancer.
The Stand Up To Cancer event each year collects money for scientific studies and therapies and prompts people to get check-ups to improve the probability of an prompt identification.
The King's candid approach about his illness, and managing the disease, has been designed to promote education and to get more people to get tested - and this will be taken a step further with this unusual royal involvement.
To date the King's key philosophy to his cancer has been to keep working, maintaining a hectic timetable alongside his frequent sessions of therapy, and he is understood not to have desired to be overshadowed by his condition.
Recently has seen the King, 77, undertaking several international tours, including to Italy and Canada, and receiving the highest tally of foreign dignitaries to the UK for almost 40 years, which included the German president in recent days.
The upcoming Stand Up to Cancer programme on television, presented by celebrities including a team of famous hosts, will urge people not to be scared of getting cancer checks.
The hosts have been personally touched by cancer - McCall said in November she had received treatment for a tumour, while Clare Balding was treated for the illness in the past. Presenter Adam Hills has previously discussed his late father, who had a diagnosis and then later blood cancer.
The show will appeal to the roughly nine million people in the UK who Cancer Research UK estimate are not compliant with public health checks, with an website to let people check if they are qualified for tests for key health indicators.
In an bid to clarify health tests and demonstrate the value of prompt detection there will be a real-time transmission from treatment centres at Addenbrooke's and Royal Papworth hospitals in Cambridge.
"The goal is to reduce the stigma surrounding health checks and demonstrate everyone that they are not alone in this," commented one of the hosts.
Right now in the UK, there are three publicly available checks - for bowel, breast and cervical cancer - offered to eligible individuals.
A recently launched scheme for lung health is also being slowly rolled out for anyone at increased risk of developing the disease, specifically targeting people in a specific age bracket, who currently smoke or used to.
Male patients may discuss specific tests, but there is no national programme in place.
The Stand Up to Cancer initiative, which has collected a significant sum for many years, is supporting 73 clinical trials encompassing thousands of patients.
King Charles, in a message for dignitaries at a gathering for cancer charities in earlier this year, had referred to recognising the "intimidating and at times scary reality" for patients and their families.
But he stated his personal journey of managing cancer had shown him that "the most difficult times of sickness can be illuminated by the support of carers," as he praised those who looked after cancer patients.
Official sources has not revealed the nature of cancer the King has, or the medical care he has been given. The King's cancer was discovered subsequent to he had undergone a medical treatment.
A semiconductor engineer with over a decade of experience in solid state device research and industry analysis.