Founder and CEO

Leonora Zilkha Williamson is the Founder of Platinum Rule Advisors (PRA), a consulting firm devoted to human capital strategy and executive coaching for leadership teams, especially of family-owned businesses. Prior to starting PRA, she served in leadership roles at J.P. Morgan, Boston Consulting Group and Estée Lauder.

Leonora’s “side hustle” is teaching Negotiation and Corporate Social Responsibility to undergraduates as a Lecturer at Vanderbilt University. She also serves on the board of family company Sabre Yachts and has served on dozens of non-profit boards, including a current seat on the board of Learning Matters, an organization working to reduce learning barriers and ensure educational equity for K-12 students with learning differences.

A graduate of Princeton University and Harvard Business School, she is a certified coach (PCC) through the International Coach Federation and a member of the Harvard Institute Of Coaching, Forbes Coaches Council, and Marshall Goldsmith’s 100 Coaches, an invitation-only group of accomplished coaches who are committed to using their talents to make people and organizations better.

She was named Nashville’s #1 Executive Coach in 2021 and 2022 by Influence Digest and has been recognized by the Nashville Business Journal as a 2022 Women of Influence award recipient.

She has lived in 8 countries, speaks 5 languages, and carries 2 passports. She lives in Nashville with her two daughters and a golden retriever named Scout.

Certifications: ICF PCC, Newfield Certified Coach, IeQ9 Accredited Enneagram Practitioner, Fearless Organization Certified Practitioner, Certified TDS Advanced Practitioner

Additional certifications of completion: Global Team Coaching Institute - Certified Team Coach, Coaches Rising - Neuroscience of Change, Coaches Rising - Somatic Coaching, Vanderbilt Osher Center for Integrative Medicine Certified Mindfulness Facilitator, Marshall Goldsmith 100 Coaches, Forbes Coaches Council, NBJ Women of Influence

Angel Bowling Horn loves working with people and helping them learn and grow.  She’s especially fond of leadership development through transformational learnings. She is a graduate of Morehead State University where she obtained her undergraduate in Education and later returned for graduate classes in Adult and Higher Education.

She began teaching elementary aged children and planned to work with kids the rest of her career.  One summer, her life took a different turn when she accepted an offer to teach a new Electronic Medical Records system to staff at a large regional medical center.  It was there that she found her true calling in adult education and corporate training. 

Angel lives in rural eastern Kentucky, literally surrounded by hilltops of home and family. She is married to her high school sweetheart and they have two teenage children.  She enjoys reading, cooking, and traveling, and in the summer you can generally find her soaking up the sun while boating and fishing on the lake.

She is often called on for administrative consultation in her father’s business.  In addition to a close-knit family and extended family, Angel’s faith in God is very important to her.  She’s a longstanding member of her church and is frequently working in her community through church events and by teaching the ladies in Sunday School.  In her spare time, she loves to bake cookies for her many nieces and nephews.