Meet Our Team



Based on her business expertise and personal experience as a private trustee, Ms. Thornton founded Foster Thornton Welling to provide objective, personalized services during life’s unexpected transitions. Foster Thornton Welling’s core values are to protect the assets, interests, and dignity of its clients. This includes individuals, families, extended families, and small businesses.

In a financial career spanning three decades, Ms. Thornton has managed budgets in excess of $60 million and coordinated the financial and day-to-day operations of professional firms with hundreds of employees. She has served as COO for several large legal firms and as Chief Financial Officer for a $40 million venture capital fund. Early in her career, Ms. Thornton became a CPA while working in the Small Business Audit and Tax Department in the Los Angeles office of Arthur Andersen & Co. In addition to financial management, she has led organizations in the areas of human resource management, technology and operations.

Since founding Foster Thornton Welling, she has successfully managed the financial affairs of individuals, families and small businesses. Ms. Thornton currently serves as Personal CFO for high net worth individuals, and as a fiduciary for trusts and estates ranging from $1 million – $80 million. In addition to her business expertise, Ms. Thornton brings discretion, professionalism, and warmth to the highly sensitive matters handled by Foster Thornton Welling.

Ms. Thornton’s credentials include:

  • Certified Public Accountant (inactive), License No. 39298
  • California Licensed Professional Fiduciary, License No. 135
  • Bachelor of Science in Business Administration, California State University, Los Angeles
  • Professional Designation in Professional Fiduciary Management for Trustees, California State University, Fullerton
  • Professional Designation in Human Resource Management, UCLA
  • Receivership Law & Practice, California Receivers Forum/Loyola Law School

Kaitlyn (Katie) Welling, California Licensed Professional Fiduciary

Ms. Welling has worked with Foster Thornton Welling since 2012, and became a licensed professional fiduciary in January 2016. She holds certificates in Professional Fiduciary Management for Trustees and Conservators, and is a licensed notary public. Katie received her Associate of Science Degree in Business Administration from Grossmont College and her Bachelor of Arts Degree in Public Administration from San Diego State University. She serves as our in-house notary public and oversees the day-to-day administrative aspects of the office. Katie has a background in customer service and hospitality, and a passion for client service, planning, organizing and problem solving. She grew up in Chula Vista and is a third generation San Diegan. Katie proudly serves as a member of the Rady Children’s Hospital Foundation Estates and Trusts Council.

Megan Kornacker, California Licensed Professional Fiduciary

Megan was born in Canada and immigrated as a child to Tucson, Arizona, with her family. She was raised with an entrepreneurial spirit by energetic parents who taught her by example that giving to others was a life well-lived. Megan credits her parents for her dedication, passion, and integrity in all that she does.

Megan’s first experience with trust and estate administration was for her father in 2001. In 2016, she joined Foster Thornton Welling as a member of the administrative staff. While working at Foster Thornton Welling, she gained hands-on experience in managing trusts and estates. She became a California Licensed Professional Fiduciary, after completion of the CSUF certifications in Trustee Management and Conservatorships.

Megan has years of experience working in the land development, contracting, and real estate industries. Subsequently, Megan created her own small business assisting seniors with trusted financial matters, including those with declining health and memory loss. These experiences have guided Megan in her current work as a professional and caring fiduciary.

On a personal note, Megan has three grown sons and five grandchildren, and enjoys her senior Australian Cattle Dog, Callie. California and Solana Beach are called home now, but always in her heart are the roots of her family in both Canada and the US.

Terri Foster, Executive Assistant

Terri joined the Foster Thornton Welling team in 2017 as an Administrative Assistant with a unique blend of talents. She has previous experience in human resource and retail management, customer service, owning and operating a day care center, and most importantly raising her two children. Terri took an active role in her children’s education by volunteering at school and extracurricular activities. She most recently served as an executive member for her daughter’s national champion ranked high school dance team being responsible for event planning, fundraising and administrative organization. She continues to serves her community through various volunteer work. Terri has a passion for working with others, and has become an integral part of serving the Foster Thornton Welling clients.

Brynne Petersen, Executive Assistant

Brynne began working as Katie Welling’s assistant in 2021 and was soon promoted to Executive Assistant in 2022. Brynne often serves as the first line of support to our clients and vendors. Drawing from her background in customer service, administration,  client relations, and management, Brynne is dedicated to providing a high level of service and a quality experience.

Prior to joining Foster Thornton Welling, Brynne served for three years as Office Manager for another local fiduciary. This experience gave her a comprehensive understanding of the profession. A quick learner and natural leader, Brynne’s ability to adapt to the ever-changing needs of our clients, together with an unmatched attention to detail, has made her an integral part of the Foster Thornton Welling team.

Born and raised in San Diego, Brynne grew up by the beaches of Pacific Beach and Ocean Beach. You can still find her there, spending time with her daughter, reading, walking along Sunset Cliffs, and cheering on the San Diego Padres.

Marissa Davis, Administrative Assistant

A native San Diegan, Marissa joined the team in 2022 as  Administrative Assistant. With her background in customer service, Marissa excels at multitasking and ensuring our clients’ needs are met.

Marissa graduated from the University of California, Santa Barbara, in 2017 with a BA in Sociology. A former collegiate club volleyball player and coach of the Girls Varsity Volleyball team at Olympian High School, Marissa is an excellent team player and leader.  When she’s not working, Marissa enjoys going to the beach, spending time with her family, and line dancing with friends.

We’re Here to Help

Are you, a loved one or a business associate experiencing a significant transition?