Died peacefully on April 16, 2026, in Ottawa surrounded by family after a courageous fight with cancer. Adored spouse to Michelle, devoted father to Nicholas, Christopher (Sofia) and Maximiliano and loving grandfather to Calian. Beloved brother to Teresita (Eddy) and Juan Martin (Margarita); brother-in-law to Stacy (Nigel); and son-in-law to Lorne and Brenda. And adoring uncle to Teresita, Ximena, Tomas, Josefina, Martina, Augustin and Hannah. Guillermo was predeceased by his loving parents Guillermo Ceppi Perdriel and Teresita Muinos Ceppi of Adrogué, Argentina.
Guillermo was the Chief Architect at Global Affairs Canada for almost two decades and an expert in diplomatic facility design. In this work he amalgamated his passion for the built environment with his love of travel and culture. Guillermo graduated from the University of Buenos Aires with a Master of Architecture degree and license and practiced architecture in Argentina before relocating to Canada for post graduate studies in architecture at McGill. Licensed in Ontario and Quebec (retired) and a fellow in the Royal Architectural Institute of Canada, he left his mark in private practice and public service. Guillermo’s early education was at St. Michael’s College in Adrogué, Argentina and he maintained many cherished lifelong friendships with “the Greens”!
Always generous with a smile and his time, he will be remembered for his wit, humour and zest for living. He lived a full life, loved and was well loved by his family and many cherished friends including Solange (Oscar) and Dario.
The family thanks Dr Derek Jonkers, Dr Charlene Habibi and Kas for their dedicated care, kindness and support during his cancer journey. In lieu of flowers donations to the Canadian Cancer Society are welcome.
A private funeral service has been held at Beechwood Funeral, Cemetery and Cremation Services.
Digital Guestbook
Hani Hammoud
Robin Dubeau
Dear Michelle and Guillermo’s family,
I was deeply saddened to learn of Guillermo’s passing.
I had the privilege of knowing Guillermo since 2008, when we worked together on the new Chancery project in Mexico. From the very beginning, he stood out not only for his professionalism, but for the way he carried himself with quiet strength, kindness, and genuine respect for those around him. He was a truly gentle and deeply human colleague, someone who brought people together and made even the most complex challenges feel manageable.
Guillermo’s perseverance and dedication to his craft were remarkable, but what I will remember most is his warmth his smile, and the ease with which he connected with others. He had a rare ability to combine excellence with humility, and to approach both his work and life with a sense of purpose and grace.
Knowing that he faced his illness with the same courage and dignity that defined his life is both humbling and inspiring.
Please accept my most heartfelt condolences. My thoughts are with you during this difficult time. Guillermo leaves behind a legacy not only of professional accomplishment, but of humanity, generosity, and a life well lived.
With deepest sympathy,
Jen Harrigan
My sincere condolences to Michelle and all of Guillermo’s family. He was a wonderful colleague for many years and was passionate about his work, he will be missed.
Toby Greenbaum
Dear Michelle and family,
My heartfelt condolences on the death of Guillermo. I have only very fond memories of Guillermo and the time we worked together.
May his memory be a blessing.
Toby
Xavier Rankin
I would like to extend my sincere condolences to Guillermo’s family. I met Guillermo over 30 years ago when he was Chief Architect for Canada, his experience and design advice was very valuable and appreciated in the design development of Parliament Hill’s West Block
Renovation. He was a pleasure to work with.
Ofelia, Jorge. Val and Jo
Dear Michelle, Nick, Chris and Max
Guillermo's passing has left us shocked with grief and sadness, while also bringing back many fond memories of the moments we shared together. Our families grew up side by side and enjoyed so many wonderful times — Christmases, summer tennis and games, afternoons by the pool, and skiing in the winter.
Though life took us in different directions as the years passed, Guillermo always remained one of our most trusted friends and a cherished part of our memories from those younger days. His warmth and friendship meant a great deal to us, and we will remember him with great fondness.
With deepest sympathy and caring,
Jessica Tranquilli Doherty
Dear Michelle and family,
Please accept my sincere condolences on the passing of Guillermo. Though words cannot ease the pain of such a loss, may you find comfort in the love that surrounds you and in the lasting memories you shared. May those memories continue to support you,
Jessica
Ofelia, Jorge, Val and Jo
Dear Michelle, Nick, Chris and Max
Guillermo's passing has left us shocked with grief and sadness, while also bringing back many fond memories of the moments we shared together. Our families grew up side by side and enjoyed so many wonderful times — Christmases, summer tennis and games, afternoons by the pool, and skiing in the winter.
Though life took us in different directions as the years passed, Guillermo always remained one of our most trusted friends and a cherished part of our memories from those younger days. His warmth and friendship meant a great deal to us, and we will remember him with great fondness.
With deepest sympathy and caring,
Ofelia, Jorge, Val and Jo
César Ansaldo
Dear Michelle and Max.
What a sad notice that Guillermo has passed away.
He’s been a very nice friend of mine during a long time.. since our childhood and during our time at school of architecture in Buenos Aires.
That was a very nice time, sharing with his beautiful family, Guillermo, Teresita his parents and Tere and Juan Martín.
Also after being graduated, we have been working together upto the time he was leaving trough Canada.
Although much people knew him, I want to tell you how happy person, how clever, and what a noble friend he was.
All my love to you both , Michelle and Max.
I will always remember Guille.
I‘ll miss him .
Randy Bloom
It's with great sadness that I offer my deepest condolences to the family....may the happy memories shared with Guillermo overtake the present sorrow...
May God bless your soul