top of page


Passionate. Curious. Committed. Caring. Experienced. Positive.

Matt Sitter

CEO, Connector, and Explorer

  • LinkedIn

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.

  • LinkedIn

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.

Hartmut Junghahn (1).webp

Hartmut Junghan

Executive & Leadership Coach and Start-up Mentor. 

  • LinkedIn

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.

Screenshot 2023-11-14 at 10.50.49 AM.png

Sylvia Tan


  • LinkedIn

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


  • LinkedIn

John holds a bachelor’s degree in Organizational Leadership & Development and when he is not helping leaders and companies thrive, his passion is breeding and training Labrador Retrievers to be service dogs for wounded warriors with PTSD and children with autism.  He lives in the woods of southern Oregon with his Wife and son and enjoys spending time on the Rogue River.


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


John is a Navy SEAL veteran with over 28 years on active duty at various SEAL Teams and Naval Special Warfare commands.  While on active-duty John deployed to Afghanistan, Iraq, Yemen, the Philippines, among other short and long term deployments to various other locations in support of U.S. Foreign Policy.

Following his time in the SEAL Teams, John was recruited by the McChrystal Group, a small elite leadership consulting firm founded by General Stanley McChrystal.  The McChrystal Group took the lessons learned by the Joint Special Operations Command (JSOC) and created a leadership methodology consistent with how elite special operations forces lead and execute on today’s technologically enhanced and everchanging modern battlefield.  During this time, John was fortunate to have had the opportunity to work with various companies across numerous industries while learning the important areas of overlap between his diverse military skills and the skills necessary to succeed and thrive in the business environment.

John is an articulate, dynamic, and engaging public speaker with a natural story telling ability.  His authentic delivery of content, insights, and perspective allows him to build trust with business leaders that leads to impactful discussions and insightful alternatives to how leadership techniques and teamwork can be accomplished in today’s dynamic, globally connected, and technologically advanced business ecosystem.

bottom of page