Experienced Family & Divorce Lawyer – 905-291-1022

Need Help in Richmond Hill, ON?


Mongillo Law Professional Corporation is a boutique firm located in Richmond Hill, ON.  As a smaller firm, our clients get an individual, focused approach. We are able to offer flexible appointments based on your schedule, including outside of regular business hours and weekends. With a dedicated team of family law professionals, each client gets a focused and unique plan to achieve your goals and protect your interests.

Leonardo Mongillo is the principal of Mongillo Law Professional Corporation with over twelve years of experience as a family law lawyer. Leonardo was a student and then an associate with a downtown boutique family law firm. He has worked in the family law field for over fifteen years. He specifically assisted clients in high conflict divorce cases. He earned a certificate to practice Collaborative Family Law and has effectively represented clients through the collaborative law process in the Greater Toronto Area.

Leonardo has an Honours Bachelor of Arts degree in Economics and Business from York University. His business acumen has assisted him in deciphering complicated financial arrangements and dealings, and provided a foundation to find solutions to the financial complexities of family law proceedings.

Leonardo has represented clients at all three levels of courts in Ontario (Ontario Court of Appeal, at the Superior Court of Justice and the Ontario Court of Justice) He has represented clients across the GTA in Toronto, Newmarket, Milton, Brampton, Oshawa, Lindsay, Peterborough, Bracebridge, and Barrie. Leonardo has represented clients in litigation, collaborative family law and through the mediation and arbitration processes. Leonardo prides himself on his negotiating skills and finding real solutions and settlements so that his clients can move on with their lives comfortably. Leonardo’s professional team and network of professionals assists him in this endeavor.

His area of practice focuses almost exclusively on family law, including domestic contracts, divorce, custody and access, child protection, support, property and equalization issues. Leonardo is a family man who understands the difficulty and joys of raising children. He understands that each family unit is unique and is sensitive to their needs in resolving family law matters.

Leonardo is a member of the Law Society of Upper Canada, The Canadian Bar Association and the Ontario Bar Association. Call us today at 905-291-1022.

The Mongillo Law Professional Corporation  Advantage:

  • Over 15 years of experience
  • We work around your schedule
  • We fight for settlements
  • Client-centric law firm
  • Dedicated team of Family Law professionals
  • Network of financial/parenting professionals
  • Mediation, arbitration and collaborative law
  • Flexible appointment availability