THE TEAM
Passionate. Curious. Committed. Caring. Experienced. Positive.
Matt Sitter
CEO, Connector, and Explorer
Favorite quote:
"We are the ones we have been waiting for." - June Jordan
MATT SITTER leads AFN and our efforts to make change into opportunity for our members. He eagerly embraces his vocation, building great relationships, teams, organizations, and networks.
Matt has been a student of optimizing performance through his experience as a senior leader at McChrystal Group and CrossLead and his leadership roles across the healthcare and technology industries.
In his spare time…
Matt lives in the Bay Area with his amazing wife and great kids. He clings to the belief that he can still play water polo with people twenty years younger than him.
Betsy Klein
Chief of Staff, Marketing, Strategic, eternally optimistic, passionate about purpose.
BETSY KLEIN serves as Chief of Staff and manages all Advantage Foundry Network (AFN) marketing. She is integral to AFN and the network, collaborating globally with CEOs and Chiefs of Staff.
Favorite quote:
"Never doubt that a small group of thoughtful, committed citizens can change the world; indeed, it's the only thing that ever has." - Margaret Mead
Betsy has been in advertising and marketing for over 25 years, collaborating with brands on creating strategic marketing plans, branding initiatives, media plans, sales promotions, and account-specific marketing. In addition, her background includes creative development, copywriting, print production, photography production, and talent representation.
Betsy lives in Sedona, Arizona, and hikes the beautiful red rocks with her husband and two rescued wolfdogs, Chaos & Theory.
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Hartmut Junghan
Executive & Leadership Coach and Start-up Mentor.
HARTMUT JUNGHAHN spends his energy trying to help others, spreading wisdom nurtured from global experiences while connecting people.
Favorite quote:
“We make a living by what we get, but we make a life by what we give.” - Winston Churchill
Hartmut spent 35+ years in several corporate public and private firms, leading diverse businesses while living and working in 8 countries. He has since become an Executive & Leadership Coach and Start-up Mentor. Hartmut is an avid seeker of knowledge who shares a great passion for the art of business excellence. He motivated, encouraged, and empowered his teams of zealous professionals in the quest for prevailing business career success. Hartmut is an ambassador of strategic leadership and is inspired by the drive to nurture the business leaders of today and tomorrow.
Hartmut lives in Key Biscayne, Florida, is an avid tennis player, and is proud of his evolving and growing family with four kids, all born in different countries, with the same loving wife and family CEO.
Sylvia Tan
Coach
Outside of her professional life, Sylvia actively volunteers for local community and non-profit organizations. In addition, she enjoys traveling extensively with her family, and her favorite sport is diving.
Favorite quote:
"Nothing is impossible, the word itself says, I'm possible." - Audrey Hepburn​
​Sylvia has accumulated over two decades of professional experience in diverse industries such as Financial, Healthcare, and Information Technology. Despite her Electrical Engineering degree, she started her career as a software developer and gradually transitioned into business and leadership positions. She has worked at prominent companies listed in the S&P 500 and eventually became a Chief of Staff at a global startup.
Having collaborated with senior executives from various industries, Sylvia has developed the essential skills to become a thought leader who can identify effective strategies to empower her clients to strive for excellence. In her role as a reliable partner, she brings in the necessary discipline to help her clients enhance their self-awareness and emotional intelligence, leading to transformational change. In addition, by employing adaptive leadership models, she guides her clients in navigating challenges, uncovering their untapped potential, and enhancing organizational performance.
John Previtera
Executive Coach | Leadership Development | Burnout & Resilience Expert
John Previtera is a seasoned executive coach and leadership culture expert who helps leaders build high-performing teams and sustain their impact over time. With deep expertise in decision-making, trust cultivation, and scalable communication systems, he works alongside senior executives to develop practical strategies that elevate team performance and leadership effectiveness.
Favorite quote:
"LEADERSHIP IS ALL ABOUT PEOPLE. It is not about organizations. It is not about plans. It is not about strategies. It is all about people - motivating people to get the job done. YOU HAVE TO BE PEOPLE-CENTERED." Colin Powell
An accredited Burnout and Resilience facilitator, John integrates performance coaching with a focus on long-term sustainability. His approach helps leaders avoid the hidden costs of burnout while enhancing their clarity, confidence, and capacity to lead under pressure.
John brings unmatched credibility to his work. He is a retired U.S. Navy SEAL with 28 years of active-duty service, including senior operational leadership roles across multiple SEAL Teams and special operations units. As Senior Enlisted Advisor within Naval Special Warfare Group ONE, he led elite teams through complex missions in Afghanistan, Iraq, Yemen, and the Philippines—refining his expertise in decentralized leadership, strategic execution, and adaptive team dynamics.
Following his military career, John was recruited by the McChrystal Group, where he advised Fortune 500 companies on organizational design and performance. Today, he is known for his authenticity, calm presence, and ability to translate high-stakes leadership experience into actionable insights for executives across industries.