Sheila P. Marcantonio

Sheila P. Marcantonio


Sheila grew up in the Village of St. George, Ontario and attended high school at North Park Collegiate in Brantford. She attended the University of Ottawa from 1979 to 1981 and then received admission to the University of Western Ontario where she obtained her law degree in 1984. Sheila also completed the third year of her BA at University of Western Ontario during the summers and received her BA from the University of Western Ontario in 1984 as well.



Sheila practiced with the law firm Harris Barr, which later became known as Daniel Wilson, from 1986 to 1998. Sheila was primarily engaged in personal injury and civil litigation on behalf of insurance companies and individuals.

From 1998 to 2005, Sheila practiced at Graves and Assoc. in a plaintiff orientated personal injury practice. Since 2006, Sheila has been practicing in personal injury litigation with Lancaster Brooks and Welch LLP.


Professional Associations

  • Member - Law Society of Upper Canada
  • Member - Lincoln County Law Association
  • Member of the Hamilton Law Association
  • Proud member of the Ontario Trial Lawyers Association
  • Deputy Small Claims Court Judge from 1996-2004
  • Past-Chairperson of School Council for Oakridge Public School
  • Former member of the Women’s Law Association
  • Former member of University Women’s Club
  • Former executive member of the Lincoln County Law Association
  • Member of Mountainview United Church

What Clients Are Saying About Sheila Marcontonio

You saved my brother's life!

Thank you Sheila for saving my brother’s life. His insurer’s refusal to pay any disability benefits greatly contributed to further breakdown of his mental health. Your advice to me at the time was the key. I could not have done that without you and I am so grateful. Now by brother is receiving his benefits and the proper psychological treatments and is doing so much better. He’s all I have in this world and thanks to you, I can still cherish time with him. May your kindness return to you over and over forever. DT

Personal Injury Client – DT

Paid attention to the smallest details

Sheila paid attention to the smallest details of my case and explained everything to me very clearly without rushing. I was pleased with all she did for me – including the settlement!

Personal Injury Client – EG

Takes care of you from start to finish

I’ve known Sheila since 2010 and I have developed a deep respect for her sharp mind, professional attitude and her sense of humor. Sheila takes care of you from start to finish, creating huge confidence in what she’s doing. I will always remember with fondness this bright woman.

Personal Injury Client – RA

Efficient, caring and informative

I found Sheila to be very efficient, caring and informative. I would recommend her to anyone.

Personal Injury Client – DH

Contact Sheila Marcontonio

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Lancaster, Brooks & Welch Logo Contact

St. Catharines Office
PO Box 790,
Ste 800 – 80 King St.

Welland Office 
PO Box 67,
Ste 202 – 3 Cross St.