Advisory Team

Get to Know Us

CFP® practitioners. Super-smart. Widely published. Modest. Really nice, too.

  • Andrea Eaton, M.S., CFP®

    Andrea Eaton, M.S., CFP®

    Principal & Financial Planner

    Andrea is a Principal and Financial Planner at Cornerstone. She was a Graduate Intern in 2004 at Cornerstone and now leads the advisory relationships with a great many of Cornerstone’s clients, who increasingly value her thoughtful advice, caring demeanor and wise counsel with each passing year. In 2018, she also became a shareholder of Cornerstone.

    Prior to joining Cornerstone, Andrea graduated from South Dakota State University in Brookings, South Dakota where she earned a Bachelor’s degree in Human Development and Family Studies. Wanting to combine her quantitative ability with the desire to help people and families, she then completed a Master’s degree in Financial Planning at Texas Tech University.

    Andrea is a member of the Financial Planning Association, keeping her up-to-date with the ever changing financial world and volunteers with the Association to benefit those who are underserved or new to the profession. She is also a CERTIFIED FINANCIAL PLANNER™ professional. Andrea has also been involved in writing and reviewing questions for the CFP® Comprehensive Exam. For 11 tax seasons, Andrea served as a volunteer income tax preparer and reviewer for Prepare + Prosper. She also served as a Big Sister through Big Brothers Big Sisters Twin Cities.

    At Cornerstone, Andrea leads it’s first-in-the-nation Financial Planning Residency. Since 2010, her leadership has diversified our profession by graduating four female financial planners to their first-choice career positions around the country as CFP® advisors.

    Andrea grew up in Sioux Falls, South Dakota and is married to her college sweetheart, Michael. They now live in Waconia, Minnesota with their two children, Luella and Anders, who bring her immense joy. In her spare time, Andrea enjoys spending time with her family outdoors, camping, cycling, and boating. Her favorite camping destinations are the Black Hills in South Dakota, Father Hennepin State Park, and Burlington Bay.

  • Jonathan Guyton, CFP®

    Jonathan Guyton, CFP®

    Principal & Financial Planner

    Jonathan is Cornerstone’s Principal and is recognized as a thought leader in the financial planning profession for his holistic work in the art and science of retirement planning. His specialties include retirement income planning and investment management with an emphasis on asset distribution and income tax planning.

    Jon is best known as the author of “Decision Rules and Portfolio Management for Retirees: Is the ‘Safe’ Initial Withdrawal Rate Too Safe?”, published in the October 2004 Journal of Financial Planning and a winner of its national Call For Papers competition. He also co-authored “Decision Rules and Maximum Initial Withdrawal Rates” with computer scientist William Klinger in its March 2006 issue. Jon was named one of ’15 Transformational Advisors’ of the past twenty years in 2013 by the readers of Investment News. He currently serves as a retirement planning columnist for the Journal of Financial Planning; his recent columns appear in the Our Publications section of this site. He is also an Expert Panelist on Retirement for the Wall Street Journal and an Online Columnist for Time and Money. Jon is regularly quoted in the New York Times, USA Today, Forbes, Business Week, Research, and Kiplinger’s Personal Finance. He has been honored to make numerous presentations to literally thousands of colleagues based on his published writings and work with clients.

    Jon graduated Phi Beta Kappa from the College of William and Mary in Virginia in 1983 with a B.A. in Economics and spent five years as a financial planner and national training officer for Ameriprise Financial (then IDS) before creating his own firm in 1990. He earned his CERTIFIED FINANCIAL PLANNER™ certification in 1989. His professional accomplishments include:

    • National Board of Directors, Financial Planning Association (FPA) (1999 – 2002)
    • Dean and Mentor, FPA Residency for New CFP® Practitioners (2003 – Present)
    • Chairman and Dean, 1999 National CFP® Masters Retreat (Lake Tahoe, CA)
    • Program Committee, 2004 FPA Convention; 2006 FPA Retreat; 2007 FPA Retreat
    • Chair, FPA Career Development Strategic Team (1999 – 2006)
    • Author, “Blazing Financial Planning Career Paths,” Journal of Financial Planning, 1999

    Jon is an Eagle Scout and is married to Michelle. They enjoy boating, cycling, travel and wine collecting together.

  • Sara Kantor, CFP®

    Sara Kantor, CFP®

    Financial Planner

    Sara Kantor is a Financial Planner at Cornerstone and a graduate of Cornerstone’s three-year Residency program. Her CERTIFIED FINANCIAL PLANNER™ coursework was through the University of Georgia – Terry School of Business and she completed the final requirements for her CFP® certification in 2016. She previously earned a Bachelor of Music in Music Education and Masters of Music in Voice Performance at the University of Minnesota – Twin Cities. Sara is an active member of the Financial Planning Association (FPA) and past president of FPA of Minnesota.

    She has maintained a private vocal studio for over twenty years and worked with her husband at their brand strategy consulting firm, KantorGroup, for five years. Her years of experience and passion for helping others gain clarity, combined with her client and business management skills, piqued her desire to help others in their personal lives through financial planning.

    Sara was raised in rural west-central Minnesota, where her parents still reside. She and her husband, Dan, live in Bloomington and enjoy home and garden projects, nurturing their two rescue kitties Leo & Nellie, traveling, sharing their love of music together, and taking in the local dining scene.

  • Coresa Cass, CFP®

    Coresa Cass, CFP®

    Financial Planner

    Coresa Cass, CFP® was promoted to Financial Planner at the beginning of 2020.

    She joined the Cornerstone team as our Client Service Associate in October 2015. Coresa earned her Bachelor’s Degree in Chemistry and Spanish at the University of Minnesota – Morris in 2009. After working six years as an Analytical Chemist, she enrolled in a CFP® Board-Registered Program at the University of Georgia’s Terry College of Business.

    Coresa was promoted to Resident in Financial Planning in 2017 and earned her Certified Financial Planner (CFP®) designation in 2018. In addition to these new roles as her career has progressed, she also became a member of the Financial Planning Association of Minnesota.

    Alongside the Cornerstone team, Coresa assists in helping our clients meet their unique goals and objectives all while achieving her own. She is most eager to help people from all walks of life while enhancing her skills in comprehensive financial planning.

    A native of New Ulm, Minnesota, Coresa enjoys spending a majority of her time outdoors with her husband, Abe. When she is not catering to their Great Dane, Zoey, she also enjoys spending time with family and friends, trips to the cabin, and exploring the Twin Cities.

  • Christina Tucker

    Christina Tucker

    Client Service Associate

    Christina is Cornerstone’s Client Service Associate. She earned her Bachelor’s Degree at the University of Minnesota in 2013 in Art History (summa cum laude), with minors in French and Medieval Studies. After graduating, she worked at a financial firm in Minneapolis and then transitioned in 2014 to Vision Loss Resources, a local Twin Cities non-profit. There, she most recently held the position of Program Coordinator for Community Services. She joined the Cornerstone team in May 2018.

    Aiming to provide exceptional service, Christina assists the Cornerstone team by attending to details, such as scheduling, assisting clients with forms, and other support tasks. She is eager to help and loves getting to know people and learning about their passions and unique outlooks on life.

    Christina is a local Minnesotan who grew up in Bloomington, lived in Minneapolis, and now lives in Duluth with her husband, Nate, and two fluffy cats, Artemis and Freya. She thoroughly enjoys painting, playing the harp, working on DIY projects around her home and garden, and finding new food spots to enjoy.

  • Andi Long, CFP®

    Andi Long, CFP®

    Resident in Financial Planning

    Andi began at Cornerstone as a Resident in Financial Planning Intern in the summer of 2019 and has since transitioned into Cornerstone’s three-year Residency Program. She graduated from Purdue University’s CFP®-certified Financial Counseling and Planning Program in December of 2019.

    During Andi’s time at Purdue, she served as the president of the Financial Planning Association (FPA) student chapter and co-authored many research projects and white pages focused on promoting financial literacy. To jumpstart her career in the financial profession, Andi was also bank teller for over a year while she was in university. Andi is excited to learn alongside Cornerstone’s advisors and clients while working toward her goal of becoming a CERTIFIED FINANCIAL PLANNER™CFP®.

    Since Andi is new to Minnesota, she spends her free time exploring the Twin Cities, making new friends, and trying new things (especially food)! She also loves traveling, spending time outdoors, going to the gym, and attempting to keep her plants alive.

  • Olivia Flynn, CFP®

    Olivia Flynn, CFP®

    Resident in Financial Planning

    Olivia began at Cornerstone as a Resident in Financial Planning in June 2020. She graduated from Loras College’s CFP®-certified Financial Planning and Wealth Management program where she also obtained degrees in Finance and Marketing in May of 2020.

    During Olivia’s time as a student, she played on the Loras College Women’s Lacrosse Team and was a founding member of the Financial Planning Association (FPA) student chapter on campus. Previously, Olivia interned at Creative Planning, Inc and Vine & Fig Tree Wealth Planning, LLC where she developed knowledge and skills specific to financial planning. Olivia is eager to learn from the Cornerstone team while pursuing her CERTIFIED FINANCIAL PLANNER™ CFP® designation.

    A native of Apple Valley, Minnesota, Olivia enjoys spending time with her family at their cabin, competitive pickleball games, and traveling.