Mentors International Leadership Team

Our leadership team is founded in our core values that we care, connect, and customize to each individual.

Mark L. Petersen

CEO and President

Mark began leading Mentors International as President and CEO in 2007. A graduate of Weber State University, he worked for 27 years in higher education administration at Weber State and Dixie State Universities). He served as the Executive Director of Public Relations and Marketing for 17 years at DSC. He was then appointed by DSC’s president to open the new Dolores Dore Eccles Fine Arts Center as Executive Director of Cultural Arts. Mark has won numerous awards from the National Council for Marketing and Public Relations, has served as the council’s president, and was honored by that council as National Communicator of the Year. Mark’s focus has been to bring Mentors’ partner organizations to profitability enabling Mentors to lift more families out of poverty.

David Stump

Chief Financial Officer

David’s financial experience has come from serving as Vice President of Finance and Controller for the international headquarters of Children’s Miracle Network (17 years). He was part of a leadership team responsible for increasing annual fundraising from $89 million to $240 million during his tenure – over $2 billion in funds raised altogether. His role in the nonprofit industry has allowed him to wear many hats that have contributed to his overall business acumen. David currently serves as Treasurer on the board of the Children’s Medical and Research Charities of America. David received his Bachelor of Art degree in Finance from Utah State University. Additionally, he holds a masters degree in Nonprofit Management (MNM) from Regis University, graduating with Honors.

Nathan McClellan

Vice President of International Operations

Nathan holds a degree in Economics and has a strong passion for microfinance and how it can be used to help the poor. Prior to Mentors, Nathan spent three years working in Market Research where he worked in sample procurement and sample analytics. Nathan has also engaged in several small entrepreneurial endeavors over the years and enjoys working with small businesses of his own and those of our Mentors clients. In May of 2013, Nathan temporally moved his family to Manila, Philippines for nine months to closely work with and enlarge the impact the organization is having on the poor.

Joe Westenskow

Director of Development

Joe Westenskow has over 13 years in the non-profit industry.  Prior to Mentors International, Joe worked with other non-profits such as LDS Philanthropies and Project REAL, securing major donor gifts for Universities, Humanitarian efforts, and causes for education. Joe has been a business owner and Entrepreneur. He attended Ricks College receiving an Associates degree in Sociology, and Utah State where he graduated Cum Laude with a Bachelors degree in Health Administration.

Sarah Barrett

Director of Marketing

Sarah Barrett has worked in the non-profit sector for over 12 years. Previous to her position at Mentors International, she worked for the Utah Safety Council helping to promote their mission of saving lives through education and training. Sarah has a background is marketing, communication, and website design. Sarah enjoys running and experimenting with new recipes. She also likes to hike and explore the National Parks with her husband and three kids. She is thrilled to have the opportunity to work with Mentors International and truly believes this organization will help end generational poverty for those it serves.

Melanie Winterton

Office Manager

Melanie Winterton came to Mentors because of her love for humanitarian aid and serving others. Before joining Mentors, Melanie was the office manager for a construction company overseeing the financial and human resource portions of the company. In her free time Melanie enjoys hiking, gardening, traveling and spending time with her family.  Melanie feels very blessed to be part of an organization that does much good in alleviating poverty in the world through self-reliance. 

International Staff

Our International Leadership Team is native to the countries whey they serve. They are deeply connected to the communities and the people they help.

Novie Tesoro

Executive Director - Philippines

Novie Tesoro began working for Mentors Philippines in 1991 as an Administrative Assistant. She was impressed with the mission of Mentors Philippines and soon became a trusted confidant to all of her superiors. A mother of three children herself, Tesoro works hard to provide the needed services offered by Mentor Philippines to help lift families out of poverty. Tesoro has held various position with Mentors Philippines and in 2013 was promoted to Executive Director.

Perfecto Gonzaga Calipes

Deputy Executive Director - Philippines

Perfecto Gonzaga Calipes, Jr. holds an MBA from Ateneo de Davao University. Before joining Mentors Philippines in 2006, Calipes, spent over 16 years in the banking industry. Calipes was happy to help share his skill in finances with those in his community to help lift families out of poverty. Outside of work, he enjoys spending time with his wife and three children.

Daniel Alberto Rodríguez Sierra

Regional Director of Operations for Latin America

Daniel Alberto Rodrigues Sierra, was born and raised Guatemala City. He has a Bachelor Degree in Business Administration and an MBA specializing in Finance and Marketing from Atlantic International University. Sierra previously served as the Executive Director in Mentors Guatemala, but was promoted in 2008 as to provide supervision to all Mentors’ Latin American programs.

Gloria De Castellanos

Program Director - Guatemala/El Salvador

Gloria de Castellanos holds a Bachelor Degree in Information Technology Science and Business Administration from a prestigious Guatemalan University.  Originally from Guatemala City, Castellanos feels blessed and grateful for being part of an organization with such lofty aims, which blesses the lives of everyone involved, not only clients, but also the their families; especially the poor children.

Otoniel Manley

Executive Director - Honduras

Otoniel Manley is a creative Engineer who loves to solve problems. His goal is to surpass each and every goal in his life. He is an optimistic believer and a natural entrepreneur. Before Mentors Honduras, Manley worked as General Manager in a family business, and also as Logistics and Production Manager in a screen printing plant.  He more than doubled productivity in every case. Born and raised in a poor environment himself, he was able to receive excellent academic and spiritual education which has prepared his mind and heart to serve and understand Mentors’ Honduras clients.

Julian Sarria

Executive Director - Peru

Julian Sarria has a Bachelor in Education with an emphasis in Computer Science and Information Systems. Sarria also holds Microfinance Certification from Peruvian Catholic University. He is very committed with Microfinance Development and the use of Information Technology and Communication (ICT) as tools for poverty reduction. Before joining Mentors Peru, Sarria served in Peru as Counsel and then Chief of the “Microfinance and ICT” of a National Project of a Consortium of 16 foundations that engage in microfinance under the methodology of community banks and solidarity groups, innovating in service delivery microfinance using technology.

Enyonam K Mensah-Dotsey

Executive Director - Ghana

Enyonam Mensah-Dotsey is an innovative person who uses creative ways in handling all challenges. A visionary who is passionate about poverty alleviation and reformation. He has worked as an accountant with a multinational organization, board member and investment advisor of a Microfinance institution, and project coordinator in a pension fund organization. Mensah-Dotsey brings experience in business and strategic planning, and entrepreneurship to Mentors Ghana’s clients. He held many leadership roles in various social groups.  He holds an MBA in Finance.