About Us

Working with landlords and tenants for the last 30 years

In 1986, Jarvis Keller Stephens was one of the first agents to realise the huge potential of the Clerkenwell area as a hub for business, leisure and retail, prompting us to open our offices in the heart of Smithfield.

Our considerable knowledge and expertise in the commercial property field, coupled with a personal service from the company’s senior directors, has contributed to creating one of the most exciting and vibrant commercial locations in London – attracting entrepreneurs, international blue chips and the cream of creative services.

We pride ourselves on having consultancy based relationships with our clients, sharing our experience and offering strategic solutions to their property requirements. As a specialist commercial agency, Jarvis Keller Stephens works with both Landlords and Tenants, specialising in renting, letting, selling and acquiring commercial property such as offices, studios, shops, restaurants, wine bars and showrooms. Operating primarily in Clerkenwell, Farringdon, Smithfield and Barbican, we are also involved in investment and development sales and acquisitions throughout London.

We believe that we’ve played an invaluable role in shaping the unique character of Clerkenwell, helping ventures of all sizes feel at home in this distinctive business community. We look forward to continuing that achievement in the years to come. 


John Keller (BA,MA,FCA) – Director

John Keller joined the Firm in 2009. But being the son of one of EC1’s commercial property trailblazers, Jeff Keller who founded the Firm over 30 years ago and has contributed greatly to creating the unique, vibrant commercial scene that EC1 is today, it is fair to say John has been in training all his life, and property is in his blood.

John has run the Firm for the last 5 years with Jeff now taking more of a backseat. John expertly deals with all aspects of commercial agency and property consultancy and acts for a wide variety of clients, many of which have been with the Firm for over 30 years, benefiting from expert knowledge and advice.

Prior to joining the Firm, John trained as a Chartered Accountant at BDO Stoy Hayward in their Baker St HQ where his focus was also on property and among his clients were British Land, F&C REIT and Dawnay Day.

John also has a First Class Degree in Finance and a Masters in Marketing, so knows a thing or two about commerce.

Outside of the office, John enjoys all sports and loves to travel especially to the Greek Islands where he is looking for a holiday home !

But as an East London boy and a family man, he never likes to stray too far from EC1.

Josh Shapiro – Negotiator

Josh joined the team recently as a negotiator with his main focus being on commercial lettings, investments and developments.

Josh is a natural deal maker with a sharp eye for detail and also the wider commercial picture.

He is currently sitting his APC to become a Chartered Surveyor.

Josh is married and is enjoying being a new dad!

Jeff Rosen BSc FRICS ACI Arb FSAC - Consultant Chartered Surveyor & RICS Registered Valuer

Jeff is our Consultant Chartered Surveyor and RICS Registered Valuer.

He has over 30 years experience dealing with Professional matters and deals with a wide range of instructions including Valuation Reports for CGT/IHT and non-loan purposes.

Jeff also undertakes lease renewals, rent reviews and estates management work throughout London and the South-East.

He has a wealth of experience including at Board level for a PLC Property Company in addition to previously holding Director level roles with leading firms of London based Chartered Surveyors.

Jeff is married with 3 children and has a passion for the outdoors and charitable work.