Our Leadership Team

Stephan Jost is the Michael and Sonja Koerner Director, and CEO of the Art Gallery of Ontario.

Following his appointment in 2016, Stephan demonstrated immediate leadership by thoughtfully exploring the AGO’s visitorship, collection and key strengths in order to strategically focus on three mission-aligned areas: art, access and learning. He has overseen the revitalization of several key areas in the Gallery, helped clarify new audience target segments; and launched Look:Forward, a major reinstallation of the AGO’s remarkable Collection.

Before joining the AGO, Stephan was Director of the Honolulu Museum of Art (HoMA) for five years, where he worked to make the Museum a welcoming and accessible place for a more diverse audience. Under his leadership, HoMA’s finances were dramatically improved; the education program expanded in reach and capacity; its membership increased by 64 per cent; and the visitor experience significantly energized.

Prior to that, he was the Director of the Shelburne Museum in Vermont, the Director of the Mills College Art Museum in Oakland, California, and held several curatorial positions at the Allen Memorial Art Museum of Oberlin College in Ohio.

Born in Michigan, Stephan holds a BA in art history from Hampshire College in Massachusetts and an MA in art history, specializing in the history of photography, from the University of Texas at Austin.

Lisa Clements was appointed Chief, Communications & Brand in 2017 and is responsible for marketing & design, communications, government relations, visitor experience, membership & data base marketing, and digital services at the AGO. Prior to this role, Lisa held the positions of Chief, Public Affairs & Communications, Director, Corporate and Public Affairs, and Associate Director, Office of the Director & CEO and Corporate Secretary.

Before joining the AGO, Lisa worked for the Ontario government for more than 11 years in various roles, including Chief of Staff to the Minister of Culture, Chief of Staff for the Government House Leader and as Senior Advisor, Issues Management, to the Minister for Children and Youth Services.

Lisa is a graduate of McMaster University where she received her BA in Canadian politics and her MA in public policy and administration.

Julian Cox joined the AGO as Deputy Director & Chief Curator in 2018. He leads the curatorial team in designing meaningful art experiences that embrace multiple—and often challenging—points of view. He focuses on exhibition planning in addition to developing the AGO’s significant collections, positioning Toronto and Ontario’s rich artistic landscape in the widest context possible to ensure the Gallery is inclusive and welcoming, and  reflects the diversity of the communities we serve.

Before joining the AGO, Julian was Chief Curator of the Fine Arts Museums of San Francisco (FAMSF), working across two museums, the de Young and the Legion of Honor. In this role, he led curatorial activities in art of the Americas, Oceania and Africa, Ancient art, European Paintings and European Decorative Arts and Sculpture, Prints and Drawings, American art, contemporary art and international textiles and costume. He also managed FAMSF’s conservation, library and publications staff.

Prior to that, he served as Curator of Photography at the High Museum of Art in Atlanta, Georgia and held several positions in the Department of Photography at the J. Paul Getty Museum in Los Angeles.

Julian holds a Master of Philosophy degree in the history of photography from the University College of Wales, and a Bachelor of Arts degree in art history from the University of Manchester.

Kate Halpenny joined the AGO in 2019 as Chief Development Officer to inspire and lead the Development team, build the AGO’s capacity for an elevated fundraising strategy aligned with the AGO’s long-term vision, and set the groundwork for future fundraising campaigns.

Before joining the AGO, Kate was the Associate Director of Development, Major Gifts at the National Ballet of Canada, where she played a leadership role in the company’s $100 million Soaring Campaign. Prior to that, she led targeted giving initiatives at United Way Toronto and was the founding Executive Director of the WoodGreen Foundation and Director of Marketing at WoodGreen Community Services. She has also held senior positions at the Canadian Film Centre and Opera Atelier.

Kate holds a Bachelor of Music from the Eastman School of Music at the University of Rochester, and received her MBA in Arts & Media Management from Schulich School of Business at York University.

Mike Mahoney currently serves as Executive Director, Corporate Special Projects and Director of Operations. He is responsible for strategic projects on behalf of the Gallery and oversees building and facilities services. 

Mike successfully led the $276 million construction project, Transformation AGO from 2005 to 2008.

Prior to joining the AGO, he was Assistant Director of Engineering and Technical Services for the Stadium Corporation of Ontario (Skydome), and Assistant Director of Engineering and Physical Plant at the University of St. Michael's College.

Nan Oldroyd joined the AGO in 2018 as Chief, People, with the responsibility of providing impactful Human Resources solutions that attract, engage and develop AGO employees and volunteers. She partners across the AGO to foster an inclusive, engaging environment that enables employees and volunteers to deliver exceptional service to the art museum’s audiences and communities.

Prior to joining the AGO, Nan was Director of Talent Management at George Brown College. Before that, at Loblaw Companies Limited Nan was Vice-President of Human Resources, where she partnered with clients to support their teams and the organization, and Senior Director of Talent, where she led talent management nationally. Nan has held increasingly progressive roles at companies including Toys R Us, Costco Wholesale, Tim Horton’s and The Home Depot.

Nan holds a Master’s degree in Work, Organization and Leadership and her Certified Human Resources Executive (CHRE) designation. Nan has been recognized with the Human Resources Professional Association (HRPA)’s Outstanding Senior Human Resources Professional Award and been named a Diversity Champion by Women of Influence. Nan is a member of HRPA’s HR Professional Magazine Editorial Advisory Board, a judge for the Canadian HR Awards and a Special Advisor to CivicAction’s Escalator: Jobs for Youth Facing Barriers initiative.

Erin Prendergast joined the AGO as Chief of Staff & Corporate Secretary in 2015. Erin is responsible for advising and assisting Leadership Team colleagues in the achievement of strategic initiatives, priority setting, corporate governance, and also manages the operation of the Directors' Office.

Erin was previously Director of Development at the Walrus Foundation, best known for publishing The Walrus magazine, from 2013 to 2015. Before joining the Walrus, she worked at the AGO for thirteen years, managing fundraising projects with goals of $1 million and above. She was the manager of the Transformation AGO fundraising campaign, which raised more than $300 million in funds. At the 2008 completion of Transformation AGO, Erin established a donor relations portfolio and helped launch the “Art Opens Minds” campaign in support of art education in 2011. Previous to these roles, Erin worked at Key Porter Books, a Canadian book publisher, and Sotheby's (Canada) Inc., an international fine art auction house.

Erin is a certified fundraising executive and holds a master's degree in publishing.

Heidi Reitmaier joined the AGO in 2019 as Deputy Director & Richard and Elizabeth Currie Chief of Education and Programs. She is responsible for leading the AGO’s Public Programming and Education initiatives, working towards creating even greater opportunities for both existing and future museum audiences and connecting our visitors with extraordinary art and ideas as the AGO becomes the imaginative centre of the city. She collaborates with artists, education and academic communities, and broadens partnerships within the arts and cultural sector around the world.

Prior to joining the AGO, Heidi was the Executive Director and CEO of the Museum of Contemporary Art Toronto (MOCA). Before her role at MOCA, Heidi served as the Dr. Robert N. Mayer Director of Learning and Public Programs at the Museum of Contemporary Art Chicago (MCA). Previously Heidi was the Curator of Education and Public Programs at the Vancouver Art Gallery and Curator of Public Programs at the Tate Gallery in London.

Heidi is an alumna of the Getty Leadership Institute Program and has contributed to numerous publications including Art Monthly, Art Forum, Tate Magazine, Women’s Art Magazine, the Women’s Art Library and the BBC. Her work was the recipient of the 2018 Education and Innovation Award from the American Alliance of Museums.

Rocco Saverino was appointed Chief Financial Officer in 2000, leading the AGO's financial oversight as well as holding responsibility for the Information Technology portfolio. Prior to this role, he held the position of Controller.

Before joining the AGO, Rocco was the Director of Finance at Humber Memorial Hospital from 1989 to 1997, and subsequently the Director of Decision Support at Humber River Regional Hospital until 1998.

He is a graduate of Ryerson Polytechnical Institute and received a diploma from the Business Administration program with a specialization in Accounting and Finance. He is a Chartered Professional Accountant (CPA) and obtained his Certified General Accountant (CGA) designation in 1993.

Christy Thompson was appointed Chief Exhibitions and Collections in 2015 with a responsibility to lead and direct the activities of exhibition and collection installation, collection care, registration and the scheduling and logistical management of gallery installations. Prior to this role, she held the position of Associate Director, Administration and Corporate Secretary in the Director's Office.

Before joining the AGO, Christy worked at The Power Plant Contemporary Art Gallery, Toronto, for ten years, holding the positions of Assistant Director, Acting Director and Head of Exhibitions.

Christy holds a BA, BFA and MFA, and is a visual artist