Executive Team

Paul Rosebush

Chief Executive Officer

Paul Rosebush has had a broad leadership career in health care and social services. He commenced his career in the Canadian Forces as a Social Work Officer and participated in deployments to Bosnia and Rwanda. Over his twenty year career in the CF Paul was posted to numerous bases across the country where he developed expertise in individual and family counselling as well as expertise in Suicide Prevention, Critical Incident Stress, and PTSD.

Following his career in the CF Paul began a career in the private and non-profit sectors with leadership roles at Durham Family Services, and Community Living Ajax-Pickering and Whitby followed by CEO roles in three hospital corporations including the Hay River Health Authority in the North West Territories and the Haliburton Highlands Health Services in Central Ontario and the South Bruce Grey Health Centre in South Western Ontario.

Paul is adept at providing leadership to complex multi-sited organizations that deliver a variety of health and community services. With a clear focus on client and patient centred care Paul has worked with his teams to build service capacity and to develop services that are highly effective and highly regarded by clients and patients. Paul has supported the development of a strong continuum of health care and social services throughout his career and has a reputation for excellent stakeholder management and forging innovative partnerships that benefit clients and patients. Paul approaches leadership from a servant-leader perspective and supports his teams to be high performing and effective. 

As a fortunate cancer survivor Paul knows how important it is to make a positive impact on the world and for those we engage with while we can. Paul also strongly believes that there is no higher responsibility for society than to ensure the safety and wellbeing of children. He is proud to be a CAST team member and it’s CEO.

After having raised a family of four children with his wife Julia, Paul is now happy to dote on his mini-Dachshunds Dylan and Daisy with Dylan having been named after his deep admiration for Bob Dylan.  Living in the same city as his favourite sports teams is also a dream come true for Paul.

Read the full version of the mandate letter

Keshwer Patel

Chief Financial Officer 

Bio Coming Soon

Lisa Tomlinson

Chief Operating Officer 

Lisa Tomlinson has over 30 years of combined experience in social work with a specific focus on child welfare, education and mental health working in both English and French. Prior to becoming Chief Operating Officer, over the past 20 years working at CAS Toronto, Lisa has held a range of progressively senior roles beginning as a front line worker to her most recent leadership position as Director of Service. Lisa possesses a Masters of Social Work from the University of Toronto with a specialization in Human Services Management and Leadership, complemented by a Bachelor of Social Work from Ryerson University. She is both an Anti-Oppression Practice Facilitator and Equity Trainer and represents CAS Toronto on the Ontario Association of Children’s Aid Societies’ French Language Service Committee.

Lisa is a collaborative leader and strategic thinker with a focus on improving child welfare practice and strengthening community partnerships. She has implemented sector-leading programs and initiatives focused on domestic violence, Anti-Black Racism and equity that have garnered national recognition and led to better outcomes for children, youth and families.


Chief Human Resources Officer - Position Currently Vacant