About William Addis


My name is William Addis and I am a solicitor specialising in employment law. I am also a Director and Owner of OSJ Law, which is the trading name of OSJ Law Limited.

My experience

In terms of my legal experience, I qualified as a solicitor in 2001 and have specialised in employment law throughout my career, mainly acting for employers on both contentious and non-contentious HR and employment law matters.

I have specialist knowledge of construction, SME (small to medium business enterprises) and owner managed businesses including medical partnerships and also act for senior executives in exit strategy negotiations including Settlement Agreements and tribunal claims.

I have been a partner in two regional legal partnerships and also managed a team of employment lawyers for over five years.     My clients and former clients have ranged from small local businesses with 5-15 employees to household names employing 500 or more employees operating globally.

Because I am based in the Weald of Kent with offices in central London, I am able to service both local and London clients whether small or large, business or individual.


OSJ Law was named after my three children, Olly, Sophie and Jake, whose initials form the letters OSJ and who provide the inspiration for my business plans and ethos, together with Rebecca my wife, who provides invaluable assistance with the financial side of business life.

Keystone Law

Established in 2002, Keystone Law is a top 100 full-service firm that utilises technology to enable lawyers to work from wherever best suits them and their clients. With 250 partner-level solicitors who have gained their experience at some of the UK’s top law firms, as well as in-house at major multinationals, Keystone’s offering spans 23 service areas and 15 sectors.

For more information on Keystone Law and the other areas of legal expertise they can provide, please see http://www.keystonelaw.co.uk/.

How to contact me

If you would like to contact me for employment law advice (or any other area of legal advice) as a business or an individual, either complete the form below or send an email, or call me on my mobile 07767 166705.