Your regional team


Picture of Paul Campbell

Paul Campbell

Head of Regional Development Americas

An IB employee since 1988, Paul has served numerous roles for the IB, most recently as the Head of Outreach and Volunteer Services at IB North America. In his current role as Head of Regional Development for IB Americas, he oversees the region’s work with interested schools, universities, governments, school districts, educational organizations, and associations of IB World Schools. He also oversees the Conference of the Americas.

Paul was educated at the University of Michigan, where he studied journalism and history. Prior to working for the IB, Paul was a staff writer and columnist for several daily newspapers in northern New Jersey, USA. He also worked for two large non-profit organizations, expediting cultural exchanges between lay people from the USA and the former Soviet Union. He now lives in Washington, DC, USA with his wife, Wendy, who is an archeologist and an expert in historic preservation, and with their daughter, Sarah.

Picture of Gloria McDowell

Gloria McDowell 

Senior Head of School Services Americas

Gloria holds a Bachelor of arts in economics from Grove City College in the US state of Pennsylvania. After graduating, she returned to Argentina-her home country-to teach Diploma Programme economics and business and management at St. Andrew's Scots School and Northlands School, both IB World Schools in the province of Buenos Aires. At Northlands, she served as head of school, as well as academic coordinator. For many years, Gloria also acted as deputy chief examiner, examiner, and workshop leader for IB business and management.

Gloria holds a teaching degree in philosophy, psychology and pedagogy from the Argentine teacher training school, Dra. Alicia Moreau de Justo, and a master’s degree in management of non-governmental organizations from Torcuato Di Tella University, the University of San Andrés (UDESA) and the Centro de Estudios de Estado y Sociedad (CEDES).

A firm believer that education is the best way to make the world a more peaceful place, Gloria has devoted her career to education and seeks to bring the benefits of the IB programmes to a growing number of students and schools.


Picture of Margot Hoerrner

Margot Hoerrner

Head of Professional Development Americas

Margot joined the IB 2010, bringing nearly 20 years of experience in program development, education and non-profit leadership, as well as a deep commitment to education and training. Prior to working for the IB, Margot served as the Vice President of Outreach and Education with the United Nations World Food Program—United States (WFP-USA).  In 2005, she lived in Jakarta, Indonesia, and worked with the Centre for Strategic and International Studies to assist in rebuilding the education infrastructure in the tsunami-destroyed region of the Aceh province. In addition, Margot worked as a teacher at The Woodlynde School outside of Philadelphia, Pennsylvania, USA for nearly ten years. During this time, Margot developed and taught a K-12 music curriculum, a seventh and eighth grade French curriculum, and established strategic partnerships with Philadelphia's creative arts community to create learning and working opportunities for her students.

Margot received a Bachelor’s degree in education and music composition from Bennington College in Vermont, USA and a master’s in public administration from the Harvard University Kennedy School in Cambridge, Massachusetts, USA.

Margot grew up in Ridgewood, New Jersey, USA and Toronto, Ontario, Canada. Currently she lives in the LeDroit Park neighborhood of Washington, DC, USA where, in 2008, she was elected to serve as ANC commissioner, working with the mayor and the DC City Council to improve public policy for a neighborhood in transition. Margot is an avid traveler with a specific interest in the developing world, is working on restoring her 100-year old house, and has always had a passion for empowering others to have an impact.

Margot is also a future IB parent, who moved her young daughter to an MYP feeder elementary school so that she could benefit from a programme that seeks to create a better world through education.

 Picture of Colleen

Colleen Duffy O’Brien

Communications and Marketing Manager Americas

Colleen has been with the International Baccalaureate since 2010. She is now responsible for delivering global marketing campaigns to IB schools across the Americas. These campaigns work to better serve the IB’s current schools as well as to enroll new types of schools that are in the region.

She holds a Bachelor of Science degree in Economics, International Business and Spanish from Marquette University in Milwaukee, Wisconsin, USA, and an MBA with a specialization in International Marketing from the George Washington University in Washington, DC, USA. She is a native English and a fluent Spanish speaker. 

Colleen is a proud Chicagoan, and has worked in the Marketing field for nearly 15 years. She began her career as an Agricultural Marketing Volunteer for the United States Peace Corps in Guatemala. There she worked with the local population to market black tea throughout the country. She then managed marketing power supplies to Latin America for a company in Chicago until moving closer to Washington to help fulfill her duties with the IB.

 Picture of Natalia Tieso

Natalia Tieso

Office and Outreach Manager

Natalia Tieso was born in Buenos Aires, Argentina, and has been involved in education and English language teaching for over 20 years. She began her career as an English teacher at the kindergarten, primary and secondary school levels at both private and public schools. Natalia was then appointed IB Diploma Coordinator at All Saint’s School in Buenos Aires, Argentina. Most recently, Natalia worked in the education publishing industry as editor and academic coordinator at Macmillan Publishers and as Head of the Marketing and Academic Services Department at Richmond Publishing. Natalia joined the IB in May 2012

Natalia graduated as a bilingual English-Spanish teacher from Escuela Normal Superior en Lenguas Vivas Sofía de Sprangenberg, a teacher training college. She holds a Bachelor’s degree in English from Universidad Argentina de la Empresa (UADE) and a certificate in Online Marketing from Universidad Tecnológica Nacional. She also holds a graduate certificate for Talent Management from Escuela Superior de Economía y Administración de Empresas (ESEADE). Natalia has completed her thesis on policy-making towards a Master’s degree in Educational Management from Universidad Torcuato Di Tella (UTDT).

In her free time, Natalia enjoys running 5 and 10 K races.

 Picture of Dalit

Dalit Halevi

IBEN Manager – Americas 

Dalit has worked in education for over 20 years. She has taught in an IB Diploma school, coordinated the Diploma Programme, and served in IBEN roles such as workshop leader, site visit member, consultant and examiner.  She is also the first IB staff to have received the IB Advanced Leadership Award.

Dalit and her family moved to the US to work for the IB in August of 2014. The IB mission statement is her motivation to support a network of hundreds of educators in the American continent who are ambassadors of our programmes and who reach out to teachers and schools so that their students can have a better learning experience and be more successful in life.

Dalit is passionate about education, believing that education impacts the world we live in, it impacts the student and the teacher, it impacts households and communities.

Dalit was born and raised in Mexico by Israeli parents, which gave her an interesting perspective of the life and culture. Dalit holds a Bachelor’s degree in Psychology and a Master´s degree in Educational Leadership.