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

Mentors International is mourning the loss of our beloved CEO and President, Mark L. Petersen. After a brave battle with cancer, he was called back home to his Father in Heaven. Mark passed away May 29, 2017. Mark served as the CEO and President of Mentors International for over 10 years. He lovingly mentored, guided, and directed this organization and brought it to where it is today, a beacon of hope in the countries that we serve.

Mark loved Mentors International and was dedicated to the mission of helping others become self-reliant. He knew many of our clients by name and he genuinely cared for each of them. Not only did he care about our clients, he cared for the staff and mentors that worked with him. Read More

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.

Dean Nolasco Bermudez

Executive Director - Philippines

Dean Nolasco Bermudez has been working for Mentors International since 2002 when he started as a Project Officer. He helped mentor and train our clients in the Philippines as they were working to qualify for their loans. Since then he has worked as a Program Manager, Branch Manager, and in 2016 he was promoted to the Executive Director for the Philippines Branch of Mentors International. He believes in the mission of Mentors International. While working for Mentors International he went back to school and received a second degree in Business Administration, with an emphasis in Human Resource. He is a dedicated and loving husband and father with four kids.

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.