We are a small, but very mighty team!

From our home office in Carlisle, Pennsylvania we develop, plan, coordinate and run high-level leadership workshops across the country. We take the time to get to know you, your organization, your needs and goals. Then, with that information we create the best leadership development experience you and your team have ever had.

The workshop with the Diamond6 team was everything I was told it would be, and then some! The program was first rate, and your speakers were the best I’ve heard. I can only say good things about what you did for us!
— Bill Hebert

Jeff McCausland, Founder & CEO


Since 2000, both domestic and internationally, Dr. McCausland has conducted numerous executive leadership development workshops and consulted for leaders in public education, US government institutions, non-profit organizations, and corporations. 

Dr. McCausland is a retired Colonel from the U.S. Army and former Dean of Academics at the U.S. Army War College.  He is a Visiting Professor of National Security at Dickinson College. 

During his military career Dr. McCausland served in a variety of command and staff positions both in the United States and Europe during the Kosovo crisis and Operations Desert Shield and Storm. 

He is a graduate of the U.S. Military Academy at West Point, the U.S. Army Airborne and Ranger schools, and the Command and General Staff College at Ft. Leavenworth, Kansas.  He holds both a Masters and Ph.D. from the Fletcher School of Law and Diplomacy, Tufts University. 

Tanya McCausland, NC, Chief Operations Officer & Wellness Speaker

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Tanya McCausland has been running Diamond6 with her father Jeff since it’s inception over 15 years ago. She is responsible for day-to-day business operations as well as assisting in the development of new workshops to keep Diamond6 on the cutting edge of effective leadership development. 

Tanya is a graduate of Penn State, B.S. in Communications. She completed two courses with the National Outdoor Leadership School (NOLS), learning valuable leadership lessons and extreme outdoor skills in one of America’s most wildest and untouched places.

During her early career as a radio producer for Martha Stewart Living Radio in New York City Tanya worked closely with staff, writers, radio hosts and celebrity guest to plan, produce and execute daily live radio programming. Thereafter she joined a business coaching firm in San Francisco. There she managed company projects, executive development events as well as sales and marketing. 

In 2012 Tanya completed a 2-year certification program in Holistic and Therapeutic Nutrition through Bauman College in Berkeley, CA. She speaks locally and nationally on executive and organizational wellness in addition to running popular online health programs. 

Holly Tiley, Office Manager & Events Coordinator

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Holly McLaughlin Tiley served as an Intelligence Operations Research Officer with the Central Intelligence Agency for three years after graduating from Dickinson College in Carlisle, PA with a BA in Spanish. She returned to Carlisle when she married in 1989. Beginning with the birth of her first child in 1992 she chose to be a stay-at-home mom and active community volunteer. Holly is a strong supporter of the community that has given so much to her and her family.   She has taken leadership positions on numerous boards, including the Friends of the Bosler Library, YMBS PTO, BSA Troop #171, APTC (local theatre camp), Cumberland County Lawyers Auxiliary, as well as St. John’s Episcopal Church. Holly brings strong organizational skills as she reenters the workforce as the Office Manager/Events Coordinator for Diamond6 Leadership.


Bri Buffington, Marketing & Communications Manager

Bri Buffington brings nearly 15 years of local small business experience to the Diamond6 Team specializing in business development. She is responsible for communications with both existing and future clients, as well as promoting Diamond6 faculty, workshops, and speaking services. Her passion for people, building and managing strong working relationships, and ability to channel her creativity into marketing makes her a terrific fit.

She graduated with her B.S. in Business Administration from Eastern University and was inducted into the Delta Mu Delta International Business Honor Society.

Van (Ally) Nguyen, Marketing & Communications Intern


Van “Ally” Nguyen, a driven senior from Vietnam, is currently an International Business and Management major at Dickinson College, PA, USA.

Traveled alone all the way from Vietnam to the U.S. for college, she constantly challenges herself by stepping out of her comfort zone. Van has earned merit scholarships and honored on the Dean’s List for three consecutive years. During her junior year, Van studied abroad in Italy in International business and Arts, as well as visiting places around Europe to fulfill her love for traveling. She also spent the following semester in New York City, exchanging at Baruch College and interning at a digital media startup. Van not only enjoys fashion and arts but also technology and data. With such diverse interests, she embraces both creativity and analytical thinking within her life and work.