He has taken leave from his position as AJC’s International Director of Interreligious Affairs in order to serve as Special Advisor to the Abrahamic Family House in Abu Dhabi.

He was born in Newbury, Berkshire, England to Bella and Rabbi Kopul Rosen, founder of Carmel College, a Jewish boarding school for boys in Oxfordshire.

[7] He refused to attend a function held by the Board of Deputies and the South African Zionist Federation that was honouring Prime Minister Vorster on his return from a visit to Israel in 1976.

[8][7] He also worked with other faith leaders and Reform colleagues at Temple Israel to set up a facility in the area to provide cheap meals for vagrants.

[12] In November 2005, Rosen was made a Knight Commander of the Order of St. Gregory the Great in recognition of his contribution to Jewish-Catholic reconciliation, making him the first Israeli citizen and the first Orthodox rabbi to receive this honour.

Rosen was appointed Commander of the Order of the British Empire (CBE) in the 2010 New Year Honours by Queen Elizabeth II.

"[8] At the 2020 G20 interfaith forum, Rosen argues that overwhelming political prejudice towards Israel is an example of antisemitism: "the way in which Israel is often presented as the source of all problems and particularly for example, as the origin of the problems in the Middle East, as if it's somehow related to the Shia-Sunni conflict or the catastrophe in Syria or to the prosecution of Copts, or with regard to the collapse of other failed states in the Middle East, is fascinating in itself.

He continues: "the national context has provided the security for a diverse spectrum of Jewish life to replenish and regenerate its ranks."

Nevertheless, he concedes that there is "a lack of creative engagement between the Traditional Jewish religious heritage and the philosophical and cultural challenges of Modernity.

He is a vigorous critic of factory farming, noting that "much of the current treatment of animals in the livestock trade makes the consumption of meat produced through such cruel conditions halachically unacceptable as the product of illegitimate means."

In addition, he has argued that the waste of natural resources and the damage done to the environment by "meat production" make a compelling Jewish moral argument for adopting a vegan diet.