My Why
What powers my practice
I love building teams to solve the hardest problems. Two decades in professional services have taught me that client value is maximized when we create an environment where our professionals can do their best work—focused on our clients, not back-office processes. That insight has shaped how I lead: with clear vision, aligned KPIs, organized data, enabling technology, and, most importantly, world-class talent.
Overview
Jeff partners with leadership to advance Michael Best’s strategic priorities, strengthen operational excellence, and support the firm’s continued growth and client service initiatives. With more than 25 years of experience leading operations, enterprise transformation, and business strategy for complex global organizations, he brings a strong track record of aligning operational infrastructure with long-term business growth.
Prior to joining Michael Best, Jeff held senior leadership roles at JLL, where he served as the global Chief Operating Officer and Chief Strategy Officer within the firm’s Capital Markets Advisory business. In these roles, he oversaw global business operations, strategic planning, technology innovation, shared services, risk management, finance, talent, marketing, legal, and large-scale transformation initiatives across multiple business lines and international markets. He worked closely with executive leadership and boards to drive operational alignment, improve business performance, and execute enterprise-wide growth strategies.
Jeff has extensive experience leading technology-enabled transformation efforts, including the implementation of AI-driven tools, operational modernization initiatives, and scalable business processes designed to improve efficiency, decision-making, and service delivery. He also led complex organizational redesigns, integration efforts tied to acquisitions, and the development of global operating models supporting teams across multiple regions and functions.
Earlier in his career, Jeff held leadership and consulting roles at Deloitte, State Farm, XO Communications, and Aon Hewitt.
Credentials
- University of Arizona, Eller College of Management, Master of Business Administration (M.B.A.), 2009, summa cum laude
- Illinois Wesleyan University, Bachelor of Arts (B.A.), Behavioral Psychology, 1999, cum laude
Engagement
- Advisory Board, Corporate Learning Network
- Guest Lecturer, Illinois Wesleyan University
- Founding Member, Chicago PropTech Forum
- Tennis Coach, Cornerstone Christian Academy
Insights

Mayer Featured in Law360 article, “Michael Best Taps Jones Lang LaSalle Exec For COO Role”
Michael Best & Friedrich LLP has welcomed a new chief operating officer from real estate brokerage firm Jones Lang LaSalle Inc., where he held senior chief operating officer and strategic leadership roles.Read
May 26, 2026

Michael Best Appoints Jeff Mayer as Firm’s Next Chief Operating Officer
National AmLaw 200 firm Michael Best is pleased to announce the appointment of Jeff Mayer as Chief Operating Officer.Read
May 19, 2026
