THE FOLLOWING INFORMATION WAS OBTAINED FROM THE PHYSICIAN REGISTER SECTION OF THE WEBSITE OF THE COLLEGE OF PHYSICIANS AND SURGEONS OF ONTARIO (WWW.CPSO.ON.CA) AS OF THE DATE AND TIME NOTED BELOW
15/05/26 14:24:53 PM

General Information

Former Name: No Former Name
Medical School: McMaster University, 2000
Gender: Woman
Languages Spoken: ENGLISH, FRENCH, SPANISH

Practice Information

Primary Business Location: Address not Available
Business Email: No Information Available
Phone: No Information Available
Fax: No Information Available

Specialties

SPECIALTY ISSUED ON CERTIFYING BODY
Psychiatry
Effective: 05 May 2010
Royal College of Physicians and Surgeons of Canada
SPECIALTY: Psychiatry
ISSUED ON: Effective: May 05 2010
CERTIFYING BODY: Royal College of Physicians and Surgeons of Canada

Hospital Privileges

No information available

Professional Corporation Information

Corporation Name: Celeste J. Thirlwell Medicine Professional Corporation
Certificate of Authorization Status: Inactive End Date: 06 Oct 2025

General Information

Former Name: No Former Name
Gender: Woman
Languages Spoken: ENGLISH, FRENCH, SPANISH
Medical School: McMaster University, 2000

Practice Information

Primary Business Location: Address not Available
Business Email: No Information Available
Phone: No Information Available
Fax: No Information Available

Specialties

SPECIALTY ISSUED ON CERTIFYING BODY
Psychiatry
Effective: 05 May 2010
Royal College of Physicians and Surgeons of Canada
SPECIALTY: Psychiatry
ISSUED ON: Effective: May 05 2010
CERTIFYING BODY: Royal College of Physicians and Surgeons of Canada

Hospital Privileges

No information available

Professional Corporation Information

Corporation Name: Celeste J. Thirlwell Medicine Professional Corporation
Certificate of Authorization Status: Inactive End Date: 06 Oct 2025

Practice Conditions

This physician is inactive (Expired, Resigned, Suspended, Revoked, or Deceased) and is not permitted to practise medicine.
This physician is inactive (Expired, Resigned, Suspended, Revoked, or Deceased) and is not permitted to practise medicine.

Current Tribunal Proceedings

No information available

Past Tribunal Proceedings (1)

Proceeding Type: Discipline referral to OPSDT
Date of Decision: 12 Dec 2025
Summary of Decision:

On December 12, 2025, the Ontario Physicians and Surgeons Discipline Tribunal found that Dr. Thirlwell committed the following acts of professional misconduct:

  • failing to maintain the standard of practice of the profession;
  • failing to respond appropriately or within a reasonable time to a written inquiry from the College; and
  • engaging in an act or omission relevant to the practice of medicine that, having regard to all the circumstances, would reasonably be regarded by registrants as disgraceful, dishonourable or unprofessional.

The Tribunal also found the registrant incompetent.

On February 11, 2026, the Tribunal ordered that:

  1. the registrant attend before the panel to be reprimanded;
  2. the Registrar revoke the registrant’s certificate of registration effective February 12, 2026 at 12:01 a.m.; and
  3. the registrant pay the College costs in the amount of $10,370 by March 13, 2026.

The "Download Full Decision" link provides the Tribunal’s decision and any reprimand.

All published OPSDT reasons are available at www.canlii.org/en/on/onpsdt/.

Hearing exhibits, including any agreed statement of facts or statement of uncontested facts, can be obtained by contacting the Tribunal Office at [email protected].
Reasons for Decision: Download Full Decision (PDF)
For more details, including any scheduled hearing dates, please visit the OPSDT website

Other Notifications (6)

Source: Inquiries, Complaints and Reports Committee
Effective Date: 26 Mar 2026
Summary:

Re: CAS-XXXXXX-XXX5H1


Caution-in-Person: 

 

A summary of a decision of the Inquiries, Complaints and Reports Committee in which the disposition includes a "caution-in-person" is required by the College by-laws to be posted on the register, along with a note if the decision has been appealed.  A “caution-in-person” disposition requires the physician to attend at the College and be verbally cautioned by a panel of the Committee.  The summary will be removed from the register if the decision is overturned on appeal or review. Note that this requirement only applies to decisions arising out of a complaint dated on or after January 1, 2015, or if there was no complaint, the first appointment of investigators dated on or after January 1, 2015. 

 

See PDF for the summary of a decision made against this member in which the disposition includes a Caution-in-Person:   


Download Full Document (PDF)
Source: Inquiries, Complaints and Reports Committee
Effective Date: 26 Mar 2026
Summary:

Re: CAS-XXXXXX-XXX9V7

Caution-in-Person: 

 

A summary of a decision of the Inquiries, Complaints and Reports Committee in which the disposition includes a "caution-in-person" is required by the College by-laws to be posted on the register, along with a note if the decision has been appealed.  A “caution-in-person” disposition requires the physician to attend at the College and be verbally cautioned by a panel of the Committee.  The summary will be removed from the register if the decision is overturned on appeal or review. Note that this requirement only applies to decisions arising out of a complaint dated on or after January 1, 2015, or if there was no complaint, the first appointment of investigators dated on or after January 1, 2015. 

 

See PDF for the summary of a decision made against this member in which the disposition includes a Caution-in-Person:   


Download Full Document (PDF)
Source: Inquiries, Complaints and Reports Committee
Effective Date: 13 Jul 2021
Summary:
Caution-in-Person:
               
A summary of a decision of the Inquiries, Complaints and Reports Committee in which the disposition includes a "caution-in-person" is required by the College by-laws to be posted on the register, along with a note if the decision has been appealed.  A “caution-in-person” disposition requires the physician to attend at the College and be verbally cautioned by a panel of the Committee.  The summary will be removed from the register if the decision is overturned on appeal or review. Note that this requirement only applies to decisions arising out of a complaint dated on or after January 1, 2015, or if there was no complaint, the first appointment of investigators dated on or after January 1, 2015.

See PDF for the summary of a decision made against this member in which the disposition includes a Caution-in-Person: 

Download Full Document (PDF)
Source: Member
Effective Date: 16 Oct 2019
Summary:
Summary of the Undertaking given by Dr. Celeste Jean Thirlwell to the College of Physicians and Surgeons of Ontario, effective October 16, 2019:

A College investigation was conducted into whether Dr. Thirlwell engaged in professional misconduct and/or is incompetent in her sleep medicine practice. As a result of the investigation:

Dr. Thirwell must not issue new prescriptions or renew existing prescriptions for or administer any of the following substances:

Narcotic Drugs (from the Narcotic Control Regulations made under the Controlled Drugs and Substances Act, S.C., 1996, c. 19); and

Narcotic Preparations (from the Narcotic Control Regulations made under the Controlled Drugs and Substances Act, S.C., 1996, c. 19). 

Source: Inquiries, Complaints and Reports Committee
Effective Date: 16 Oct 2019
Summary:
Caution-in-Person:
               
A summary of a decision of the Inquiries, Complaints and Reports Committee in which the disposition includes a "caution-in-person" is required by the College by-laws to be posted on the register, along with a note if the decision has been appealed.  A “caution-in-person” disposition requires the physician to attend at the College and be verbally cautioned by a panel of the Committee.  The summary will be removed from the register if the decision is overturned on appeal or review. Note that this requirement only applies to decisions arising out of a complaint dated on or after January 1, 2015, or if there was no complaint, the first appointment of investigators dated on or after January 1, 2015.

See PDF for the summary of a decision made against this member in which the disposition includes a Caution-in-Person:

Download Full Document (PDF)
Source: Inquiries, Complaints and Reports Committee
Effective Date: 16 Oct 2019
Summary:
Caution-in-Person:
               
A summary of a decision of the Inquiries, Complaints and Reports Committee in which the disposition includes a "caution-in-person" is required by the College by-laws to be posted on the register, along with a note if the decision has been appealed.  A “caution-in-person” disposition requires the physician to attend at the College and be verbally cautioned by a panel of the Committee.  The summary will be removed from the register if the decision is overturned on appeal or review. Note that this requirement only applies to decisions arising out of a complaint dated on or after January 1, 2015, or if there was no complaint, the first appointment of investigators dated on or after January 1, 2015.

See PDF for the summary of a decision made against this member in which the disposition includes a Caution-in-Person:

Download Full Document (PDF)

Current Tribunal Proceedings

No information available

Past Tribunal Proceedings (1)

Proceeding Type: Discipline referral to OPSDT
Date of Decision: 12 Dec 2025
Summary of Decision:

On December 12, 2025, the Ontario Physicians and Surgeons Discipline Tribunal found that Dr. Thirlwell committed the following acts of professional misconduct:

  • failing to maintain the standard of practice of the profession;
  • failing to respond appropriately or within a reasonable time to a written inquiry from the College; and
  • engaging in an act or omission relevant to the practice of medicine that, having regard to all the circumstances, would reasonably be regarded by registrants as disgraceful, dishonourable or unprofessional.

The Tribunal also found the registrant incompetent.

On February 11, 2026, the Tribunal ordered that:

  1. the registrant attend before the panel to be reprimanded;
  2. the Registrar revoke the registrant’s certificate of registration effective February 12, 2026 at 12:01 a.m.; and
  3. the registrant pay the College costs in the amount of $10,370 by March 13, 2026.

The "Download Full Decision" link provides the Tribunal’s decision and any reprimand.

All published OPSDT reasons are available at www.canlii.org/en/on/onpsdt/.

Hearing exhibits, including any agreed statement of facts or statement of uncontested facts, can be obtained by contacting the Tribunal Office at [email protected].
Reasons for Decision: Download Full Decision (PDF)
For more details, including any scheduled hearing dates, please visit the OPSDT website

Other Notifications (6)

Source: Inquiries, Complaints and Reports Committee
Effective Date: 26 Mar 2026
Summary:

Re: CAS-XXXXXX-XXX5H1


Caution-in-Person: 

 

A summary of a decision of the Inquiries, Complaints and Reports Committee in which the disposition includes a "caution-in-person" is required by the College by-laws to be posted on the register, along with a note if the decision has been appealed.  A “caution-in-person” disposition requires the physician to attend at the College and be verbally cautioned by a panel of the Committee.  The summary will be removed from the register if the decision is overturned on appeal or review. Note that this requirement only applies to decisions arising out of a complaint dated on or after January 1, 2015, or if there was no complaint, the first appointment of investigators dated on or after January 1, 2015. 

 

See PDF for the summary of a decision made against this member in which the disposition includes a Caution-in-Person:   


Download Full Document (PDF)
Source: Inquiries, Complaints and Reports Committee
Effective Date: 26 Mar 2026
Summary:

Re: CAS-XXXXXX-XXX9V7

Caution-in-Person: 

 

A summary of a decision of the Inquiries, Complaints and Reports Committee in which the disposition includes a "caution-in-person" is required by the College by-laws to be posted on the register, along with a note if the decision has been appealed.  A “caution-in-person” disposition requires the physician to attend at the College and be verbally cautioned by a panel of the Committee.  The summary will be removed from the register if the decision is overturned on appeal or review. Note that this requirement only applies to decisions arising out of a complaint dated on or after January 1, 2015, or if there was no complaint, the first appointment of investigators dated on or after January 1, 2015. 

 

See PDF for the summary of a decision made against this member in which the disposition includes a Caution-in-Person:   


Download Full Document (PDF)
Source: Inquiries, Complaints and Reports Committee
Effective Date: 13 Jul 2021
Summary:
Caution-in-Person:
               
A summary of a decision of the Inquiries, Complaints and Reports Committee in which the disposition includes a "caution-in-person" is required by the College by-laws to be posted on the register, along with a note if the decision has been appealed.  A “caution-in-person” disposition requires the physician to attend at the College and be verbally cautioned by a panel of the Committee.  The summary will be removed from the register if the decision is overturned on appeal or review. Note that this requirement only applies to decisions arising out of a complaint dated on or after January 1, 2015, or if there was no complaint, the first appointment of investigators dated on or after January 1, 2015.

See PDF for the summary of a decision made against this member in which the disposition includes a Caution-in-Person: 

Download Full Document (PDF)
Source: Member
Effective Date: 16 Oct 2019
Summary:
Summary of the Undertaking given by Dr. Celeste Jean Thirlwell to the College of Physicians and Surgeons of Ontario, effective October 16, 2019:

A College investigation was conducted into whether Dr. Thirlwell engaged in professional misconduct and/or is incompetent in her sleep medicine practice. As a result of the investigation:

Dr. Thirwell must not issue new prescriptions or renew existing prescriptions for or administer any of the following substances:

Narcotic Drugs (from the Narcotic Control Regulations made under the Controlled Drugs and Substances Act, S.C., 1996, c. 19); and

Narcotic Preparations (from the Narcotic Control Regulations made under the Controlled Drugs and Substances Act, S.C., 1996, c. 19). 

Source: Inquiries, Complaints and Reports Committee
Effective Date: 16 Oct 2019
Summary:
Caution-in-Person:
               
A summary of a decision of the Inquiries, Complaints and Reports Committee in which the disposition includes a "caution-in-person" is required by the College by-laws to be posted on the register, along with a note if the decision has been appealed.  A “caution-in-person” disposition requires the physician to attend at the College and be verbally cautioned by a panel of the Committee.  The summary will be removed from the register if the decision is overturned on appeal or review. Note that this requirement only applies to decisions arising out of a complaint dated on or after January 1, 2015, or if there was no complaint, the first appointment of investigators dated on or after January 1, 2015.

See PDF for the summary of a decision made against this member in which the disposition includes a Caution-in-Person:

Download Full Document (PDF)
Source: Inquiries, Complaints and Reports Committee
Effective Date: 16 Oct 2019
Summary:
Caution-in-Person:
               
A summary of a decision of the Inquiries, Complaints and Reports Committee in which the disposition includes a "caution-in-person" is required by the College by-laws to be posted on the register, along with a note if the decision has been appealed.  A “caution-in-person” disposition requires the physician to attend at the College and be verbally cautioned by a panel of the Committee.  The summary will be removed from the register if the decision is overturned on appeal or review. Note that this requirement only applies to decisions arising out of a complaint dated on or after January 1, 2015, or if there was no complaint, the first appointment of investigators dated on or after January 1, 2015.

See PDF for the summary of a decision made against this member in which the disposition includes a Caution-in-Person:

Download Full Document (PDF)

Training

Medical School: McMaster University, 2000

Registration History

DETAILS DATE
Revocation by Ontario Physicians and Surgeons Discipline Tribunal. Effective: 12 Feb 2026
Expired: Failure to Renew Membership Effective: 07 Aug 2025
Terms and conditions amended by Inquiries, Complaints and Reports Committee. Effective: 05 Nov 2021
Terms and conditions amended by Member. Effective: 01 Nov 2019
Transfer of class of registration to: Restricted Certificate Effective: 16 Oct 2019
Arrow_iconTerms and conditions imposed on certificate by: Member Effective: 16 Oct 2019
Expired: Terms and conditions imposed on certificate by Registration Committee Effective: 18 Apr 2013
Subsequent certificate of registration issued: Independent Practice Certificate Effective: 18 Apr 2013
Subsequent certificate of registration issued: Restricted Certificate Effective: 07 May 2010
Arrow_iconTerms and conditions imposed on certificate by: Registration Committee Effective: 07 May 2010
Expired: Terms and conditions of certificate of registration Effective: 31 Dec 2009
First certificate of registration issued: Postgraduate Education Certificate Effective: 01 Jul 2001
DETAILS: Revocation by Ontario Physicians and Surgeons Discipline Tribunal.
Date: Effective: 12 Feb 2026
DETAILS: Expired: Failure to Renew Membership
Date: Effective: 07 Aug 2025
DETAILS: Terms and conditions amended by Inquiries, Complaints and Reports Committee.
Date: Effective: 05 Nov 2021
DETAILS: Terms and conditions amended by Member.
Date: Effective: 01 Nov 2019
DETAILS: Transfer of class of registration to: Restricted Certificate
Date: Effective: 16 Oct 2019
DETAILS: Terms and conditions imposed on certificate by: Member
Date: Effective: 16 Oct 2019
DETAILS: Expired: Terms and conditions imposed on certificate by Registration Committee
Date: Effective: 18 Apr 2013
DETAILS: Subsequent certificate of registration issued: Independent Practice Certificate
Date: Effective: 18 Apr 2013
DETAILS: Subsequent certificate of registration issued: Restricted Certificate
Date: Effective: 07 May 2010
DETAILS: Terms and conditions imposed on certificate by: Registration Committee
Date: Effective: 07 May 2010
DETAILS: Expired: Terms and conditions of certificate of registration
Date: Effective: 31 Dec 2009
DETAILS: First certificate of registration issued: Postgraduate Education Certificate
Date: Effective: 01 Jul 2001