John O’Sullivan M.A., LL. B.

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John O’Sullivan set up a boutique litigation practice in 2012 after 25 years with an established Toronto firm.  He draws on the network of lawyers and other professionals he has developed over the years, to assemble a team of the size and expertise required to handle each file. Read more >


(These lawyers are not employees, associates, or partners of John O’Sullivan)

Oscar Strawczynski B.C.S., J.D.


Oscar’s practice at Feldman Lawyers includes a wide variety of commercial, corporate and employment disputes.  In addition to representing his own clients, Oscar also assists other litigators in developing strategies and drafting court materials.  He works with John O’Sullivan on a regular basis.

Oscar received his J.D. from the University of Toronto.  He was called to the Bar of Ontario in 2006 after articling at a large Bay Street firm. He brings superb powers of research, analysis and simplification to every case.


Lucinda Main B.A. (Hons), LL.B.


Lucy is John O’Sullivan’s “go to” resource for cases involving issues of taxation of trusts and estates, and all aspects of the administration of estates and other trusts.

Lucy is a partner in Beard Winter LLP’s Trusts and Estates Planning Group, and a Trust and Estate Practitioner (TEP) as designated by the Society of Trust and Estate Practitioners (STEP).  She previously worked in the Wealth Management and Tax groups of an international law firm.  Lucy’s practice is devoted to estate and trust planning and administration matters and, as such, she advises Canadian and international clients on a wide range of estate, trust and tax matters.  Lucy was called to the Bar in 2008.

Sara Beheshti


Sara Beheshti holds a B.A. in French literature and a J.D. from the University of Toronto. She is John O’Sullivan’s primary resource for all issues concerning any aspect of real estate law. She regularly assists John O’Sullivan on his cases and has appeared with him as junior counsel at trial.

Sara Beheshti practices real estate law and estate planning in Toronto. She is often retained by estate and civil litigators to advise on real estate law and transactions, including title transfers, fraud prevention, and the registration of cautions and court orders. Sara is Vice-Chair of the OBA Real Property Section. She was called to the Bar in 2008 and founded her firm in 2010.

Sara Beheshti’s website:

Andrea Tratnik


Andrea is an associate lawyer at Beard Winter LLP. She was called to the Bar of Ontario in 2012.  She provides top-notch junior lawyer services in contentious trusts and estates matters. She combines a talent for incisive problem analysis, with powerful legal research skills.

In her practice Andrea advises clients on a wide range of matters pertaining to estate planning and administration, international and domestic trusts, guardianship, and succession planning. She also establishes and advises privately-held companies, including not-for-profit organizations and charities.

Andrea has written and co-authored articles on several topics for Canadian and international publications, including articles on taxation, trusts, and estates law.


Forensic accounting, damages quantification, business valuation

Nancy Rogers C.P.A., CA, I.F.A., C.B.V., C.I.P., C.F.F.,




Peter Macaulay, C.A., I.F.A.

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Nancy and Peter are two outstanding litigation accountants with whom John O’Sullivan has worked over the years.  They are adept communicators of complex matters in simple form. Their focus is to deliver reports and analyses in a form that is clear and digestible, for clients , judges and lawyers.




Rachel Headley


Rachel began her career working at the Ontario courts in 2007.  She oversees the preparation of material to be filed in court, supervises service and filing, liaises with clients, court staff and other lawyers.