Patricia Callaway is Partner and Managing Director of Manual, a San Francisco-based design and branding studio. Manual has partnered with cultural institutions (The Obama Foundation and Presidential Center, the Eames Institute), global tech companies (Apple, Google, Airbnb), and innovative startups (Quilt, Vast, Lightship, Mill). Beyond her work at Manual, Patricia serves on the boards of Well Beyond Academics and is involved with Blood Cancer United. Patricia has two teenage daughters, one of whom was fortunate to experience an adventure with AMIGOS in Costa Rica.

She earned her degree in English Literature from UNC-Chapel Hill and began her career in London working first in publishing, and then in marketing at the Barbican, Europe’s largest multi-arts center. After moving to San Francisco in 2006, she led product marketing for a software company before founding Manual with her partner Tom in 2009.

With over 20 years of experience, Dr. Boester is a trusted Obstetrician and Gynecologist at Weill Cornell Medicine and has been an integral part of the institution’s commitment to patient care and medical education. Recognized for her commitment to providing comprehensive personalized care to women at all stages of life, she offers expertise in managing everything from routine wellness exams to complex obstetrical care.

A cum laude graduate of Tufts University, Dr. Boester earned her medical degree at the University of Maryland School of Medicine. She went on to complete her residency in Obstetrics and Gynecology at the Drexel University College of Medicine before joining the faculty at Weill Cornell in 2005.

Dr. Boester is known for her patient-centered approach to patient care that is grounded in empathy and collaboration. She strives to create a supportive environment where women feel comfortable, informed, and confident in their health decisions. She’s passionate about empowering women to take charge of their health by giving them the knowledge and support they need. Patients appreciate her warm, compassionate style and the lasting relationships she builds with them over the years.

When she’s not caring for patients, Dr. Boester enjoys spending time with her family of 3 boys and loves skiing, hiking, camping and traveling.

In his role as President and Vice Chairman at David Weekley Homes, Chris Weekley leverages his expertise in innovation and developer relationships to drive growth and expansion, while representing the Weekley brand on behalf of the company. He is also leading efforts to strengthen the company’s land position by partnering with developers and pursuing opportunities to self-develop land in key markets. Through these efforts, Chris helps ensure the company remains privately held, resilient in a shifting market and well-positioned to fulfill its Purpose of Building Dreams, Enhancing Lives.

He began his career with David Weekley Homes in 2007 as a Builder and Sales Consultant in Austin, then moved to Houston where he continued to grow into senior leadership roles, including Division President, Vice President of Central Living and Innovation, and Executive Vice President. Among his accomplishments, he spearheaded the launch of Central Living by David Weekley Homes, introducing low-maintenance homes in urban infill locations, and has played a key role in shaping strategies that support growth and innovation across the company.

Prior to joining Weekley Homes, Chris worked as a Project Manager for a developer in San Francisco, specializing in urban and suburban residential development. He graduated from Vanderbilt University with a Bachelor of Science in Human and Organizational Development and received his Master of Business Administration in Entrepreneurship from The Acton School of Business.

When he is not at work, Weekley can be found spending time with his five children. He currently serves on the board of The FORGE for Families and is the Board Chair of the Greater Houston Community Foundation. He and his family are members of Chapelwood Church.

Sarah Heck (San Francisco, CA) served as head of entrepreneurship for Stripe, enabling entrepreneurs globally to start and grow internet businesses, and an advisor to the Obama Foundation. Previously, Heck was director for global engagement on the National Security Council, leading global entrepreneurship policy and youth demographics, among other roles. She also held several positions at the US Department of State focusing on public diplomacy, countering violent extremism, entrepreneurship, and technology in diplomacy. Before that, Heck worked at Kissinger McLarty Associates and was Paraguay country director for Amigos de las Américas. She’s a Truman National Security Project Fellow, Council on Foreign Relations term member, and board member of Young Professionals in Foreign Policy.

Kim recently retired as a healthcare executive after 40+ years in the management of sales; clinical operations; financial planning and budget execution; strategic planning; business development; client/partner service; and training and implementation.

Kim’s AMIGOS journey began as a Volunteer in Ecuador ‘75; Volunteer and then Route Leader in Nicaragua ‘76 and Route Leader in Ecuador ‘77.

Kim’s post-AMIGOS international experience includes her selection as an Advisor in The Emerging Markets Development Advisers Program (EMDAP) for developing businesses in Guatemala and Chile.  EMDAP was a fellowship and cooperative activity between the U.S. Agency for International Development (USAID) and the Institute for International Education. She was also Vice-President and Chief Operating Officer for E. Petrich and Associates, a USAID subcontractor where she oversaw operations, recruitment, contracting and advisor training for health care projects based in Egypt, Russia, Uganda and Kazakhstan.

Kim earned an MBA in International Development from California Polytechnic State University (Cal Poly) in San Luis Obispo, and a BS in Nursing, Minor in Spanish from Wichita State University.

Kim is married to Bob and lives in Kansas City, Missouri. She enjoys spending time with her four sons, four daughters-in-law and four grandchildren.

Mr. Hafner is a Managing Director at Greenhill & Co. He principally advises clients in the energy sector as well as financial sponsors.

Prior to joining Greenhill, Michael was Head of Energy for EMEA at UBS in London. Prior to that, he was a Managing Director at Deutsche Bank, first in Houston, then as Head of Energy EMEA based in London. Prior to that, he was a Managing Director at Morgan Stanley, where he spent 14 years based in New York and Houston.

Michael holds an MBA from The Wharton School of the University of Pennsylvania and an AB from Dartmouth College. He lives in Houston, Texas with his wife and three sons, all of whom participated in AMIGOS programs.

Dr. Tessie San Martin is the Chief Executive Officer of FHI 360, an international nonprofit working to improve the health and well-being of people in the United States and around the world. 

A vocal advocate for gender equality, she has dedicated her career to creating a better and more just world for people everywhere. 

Prior to joining FHI 360, Dr. San Martin was CEO and President of Plan International USA, an international development and humanitarian organization that partners with adolescent girls and children around the world to overcome oppression and gender inequality. 

Previously, Dr. San Martin served as group vice president at Abt Associates and as director for the Operations Group of the World Bank’s Multilateral Investment Guarantee Agency. 

She has more than 30 years of experience working as an executive in the public and private sectors, bilateral and multilateral development agencies and academia, focusing especially on economic growth and political reform. She has been a forceful advocate for aid effectiveness, serving as co-chair of the Modernizing Foreign Assistance Network and a board member of Friends of Publish What You Fund. 

Dr. San Martin has a Ph.D. in Political Economy and Government from Harvard University. She is fluent in Spanish and has a working knowledge of French. 

She credits Amigos de las Americas for launching her career in international development. She first came to AMIGOS in 1974, when as a sophomore in high school she joined the Miami Chapter and went to Paraguay for five weeks as a volunteer to vaccinate children against the measles. She came back in 1975 as staff, working as a Route Leader in Honduras and the Assistant Project Director in Western Honduras in 1976. 

Katherine Lorenz is president of the Cynthia and George Mitchell Foundation.

She is the leader of the Next Gen of the Giving Pledge, and Inside Philanthropy recently named  Lorenz one of the most powerful heirs in philanthropy.

Previously, she served as senior advisor for the National Center for Family Philanthropy and deputy director for the Institute for Philanthropy. Prior to that, Lorenz lived in Oaxaca, Mexico for six years where she co-founded Puente a la Salud Comunitaria, a non-profit organization working to advance food sovereignty in rural Oaxaca. She continues to be involved with Puente’s work as an active board member. Before founding Puente, she spent two summers living in communities in Latin America with Amigos de las Américas (AMIGOS). She has also served on the AMIGOS Program Committee and as a trustee of the Foundation for AMIGOS.

Additionally, she currently serves on the boards of directors of the Environmental Defense Fund (vice-chair), the Tinker Foundation, and the Endowment for Regional Sustainability Science, and formerly was a Fellow and later Board Chair at the National Center for Family Philanthropy, Board Chair of The Philanthropy Workshop, a board member of Exponent Philanthropy, Resource Generation, the Amaranth Institute, and a member of the National Academies’ Roundtable of Science and Technology for Sustainability. Lorenz serves on the advisory council of Boldly Go Philanthropy, the Leadership Council of the Greater Houston Community Foundation, the National Advisory Committee of USC’s Irene Hirano Inouye Philanthropic Leadership Fund, and as a senior advisor for Philanthropy for Marsh Creek Social Works.

Lorenz holds a B.A. in economics and Spanish from Davidson College.