About Joston Legal Services Professional Corporation

Joston Legal Services Professional Corporation, which also operates as Joston Law LLP, is a small legal practice in downtown Oshawa. Its team includes lawyers, licensed paralegals, law clerks and administrative staff with more than 30 years of combined experience. The firm's work spans civil and commercial litigation, employment and immigration law, contract review, wills, powers of attorney, marriage contracts and separation agreements, small claims, landlord and tenant and Human Rights Tribunal matters, debt enforcement, and notary and commissioning services. For process serving and bailiff work such as commercial lockouts and asset recovery, Joston relies on outside providers rather than handling those functions directly.

The firm's lawyers bring different backgrounds to the practice. Samuel R. Baker holds a King's Counsel appointment, earned a BA and LLB from the University of Alberta, and completed a Master of Laws in international law at Stanford University, where Baker also served as a teaching fellow and is a Fellow of the Patent and Trademark Institute of Canada. Calvin Zhang and Ye Yuan, the firm's other lawyers, graduated from Queen's University Faculty of Law and Osgoode Hall Law School respectively and were both called to the Ontario bar in 2020; both are fluent in English and Mandarin.

Milestones & recognition

  • Samuel R. Baker holds a King's Counsel (K.C.) appointment, a designation given to lawyers recognized for their contribution to the legal profession, and is a Fellow of the Patent and Trademark Institute of Canada.
  • Calvin Zhang and Ye Yuan were both called to the Ontario bar in 2020, after graduating from Queen's University Faculty of Law and Osgoode Hall Law School respectively.

In the community

  • Joston supports St. Joseph's Orphanage for Children in Vembar, India, founded in the late 1800s and run by the Sisters of the Holy Ghost Parish, which houses, feeds and educates more than 85 children; the firm sponsors meals for the children every Sunday.
  • As of July 2023, Joston's website reported that its support, together with the orphanage's successor program, the Santiago Mission, had helped provide more than 40,000 meals to children whose families could not afford food.
  • Joston also supports the Toronto Wildlife Centre and the Chalice International Aid Society.

Good to know

A person using a wheelchairWheelchair accessible

This firm’s lawyers at a glance

Called to the bar
2020 · median 6 years in practice 1 of 2 lawyers
Law schools
Queen's University Faculty of Law, University of Alberta 2 of 2 lawyers
Languages on the roster
English, Mandarin

The neighbourhood

Joston's office sits on Ontario Street in downtown Oshawa, one of the addresses listed in the Downtowns of Durham business directory. The surrounding blocks hold some of the city's cultural landmarks, including the Regent Theatre, Parkwood Estate and the Canadian Automotive Museum, all within walking distance. It's a downtown built more around those historic sites than around quick highway access, and visitors coming from outside the core generally plan to arrive by car.

Frequently asked questions

What areas of law does Joston handle?
Joston handles civil and commercial litigation, employment and immigration law, contract review, wills, powers of attorney, marriage contracts and separation agreements, small claims, landlord and tenant and Human Rights Tribunal matters, and notary and commissioning services.
I'm dealing with a landlord and tenant dispute in Oshawa. Can the firm help?
Joston represents landlords and tenants in disputes before Ontario's Landlord and Tenant Board and can review notices, prepare a response, and appear at a hearing.
Can Joston prepare my will and power of attorney?
Joston drafts wills and powers of attorney, along with marriage contracts and separation agreements, as part of its estate and family document work.
Does the firm handle immigration matters?
Joston's lawyers handle immigration law matters as part of the firm's practice.
Where is Joston located and what are its hours?
Joston's office is at 89 Ontario St in downtown Oshawa and is open Monday to Friday from 9:30 a.m. to 4:30 p.m.
Does anyone at the firm speak Mandarin?
Joston's lawyers Calvin Zhang and Ye Yuan are both fluent in English and Mandarin, in addition to English-language service from the rest of the team.

Where to find them

89 Ontario St, Oshawa, ON L1G 4Y9 · 905-725-0255

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Listing compiled from the firm’s public website in September 2026. Verify licence status in the Law Society of Ontario directory ↗