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10 leadership consultants
These ten leadership consultants hold or have held consulting, advisory and coaching roles focused on developing leaders and executive teams. Readers can learn how leadership consultants assess executives, build leadership pipelines and help senior teams work together through change.
Professionals to explore
01—10Darren Overfield
LinkedInExperience: EVP, Coaching & Consulting · Kaiser Leadership Solutions
EVP, Coaching & Consulting at Kaiser Leadership Solutions since 2022 and former VP, Learning Solutions there (2013–2022). His profile says he helps executives become more effective leaders and leadership teams improve their performance by developing the behaviors and mindsets required for business success. The listing also shows Senior Consultant at Kaplan DeVries Inc. (2009–2024) and President at Overfield Leadership Group, LLC (2011–2022).
David Dávila
LinkedInExperience: Managing Consultant · YSC Consulting, part of Accenture
Managing Consultant at YSC Consulting, part of Accenture, since 2023; the listing also shows Accenture Strategy, Talent & Organization, Leadership & Culture Practice at Accenture since 2023 and Communication, Media & Technology Talent Reinvention Partner, Leadership Acceleration at Accenture since 2026. His profile says he advises boards and C-suite leaders on CEO succession, executive assessment, senior team effectiveness and cultural transformation.
Dianne Nilsen, PhD
LinkedInExperience: Managing Partner and Executive Consultant Organizational Effectiveness Leadership Development · Curphy Leadership Solutions
Managing Partner and Executive Consultant Organizational Effectiveness Leadership Development at Curphy Leadership Solutions since 2015; her profile says she helps clients achieve business objectives through more effective leadership, stronger talent and aligned organizational culture. She was previously Vice President (VP), Client Solutions Global Talent Management Fortune 1000 at Korn Ferry (2009–2012) and Vice President (VP), Director, Leadership Development Products at Personnel Decisions International (PDI) (2000–2008).
Harry Dellane, PsyD
LinkedInExperience: Managing Principal · Executive Leadership Advisors
Managing Principal at Executive Leadership Advisors since 2017 and former Partner at RHR International (2012–2017). His profile describes a business psychologist and human capital executive with a record of delivering practical talent management results and accelerating executive performance at the C-suite level. He was also Global Director of Talent at Acumen (2008–2012).
Jeff Graddy, Ph.D.
LinkedInExperience: Partner, Leadership Advisory · Avion Consulting
Partner, Leadership Advisory at Avion Consulting since 2015 and former Principal Consultant, Leadership Development at Leadership Research Institute, Inc. (2003–2014). His profile says he advises organizations on how to build more effective leaders and stronger leadership pipelines, and that through coaching and advisory work he helps CEOs and their executive teams.
Jeffrey Quinn
LinkedInExperience: Managing Principal · Leadership Insights & Development, LLC
Managing Principal at Leadership Insights & Development, LLC since 2013 and former Partner, Talent & Rewards, Leadership Service Line at Aon (1991–2012). His profile describes a certified executive coach (ICF-PCC), HR and leadership consultant and industrial/organizational psychologist who coaches C-level, senior leader and partner-level clients and is certified in team coaching and team effectiveness.
Michael Quoia
LinkedInExperience: Co-Founder and Partner · KSE Leadership
Co-Founder and Partner at KSE Leadership since 2025, a title the listing also shows there for 2014–2022. He was Executive Director, Leadership Advisory at Russell Reynolds Associates (2022–2024) and Partner, Leadership Consulting Practice at Heidrick & Struggles (2006–2012). His profile says he helps CEOs, CHROs and investors build stronger leadership teams and prepare for disruptive change driven by AI and new technologies.
Nisha Advani, PhD, MPS
LinkedInExperience: Principal, Executive Coach & Consultant · Advani Consulting
Principal, Executive Coach & Consultant at Advani Consulting since 2015; her profile describes an executive coach and leadership and organizational consultant focused on developing conscious leaders and teams, with expertise in leadership and executive development. She was previously Sr. Principal, Global Talent Management & Development, Pharma at Genentech (2011–2014) and Director, Executive Talent Development at Genentech (2005–2010).
Ron Sepielli
LinkedInExperience: Leadership Sherpa President Owner Principal Consultant · Retriever Advisors
Leadership Sherpa President Owner Principal Consultant at Retriever Advisors since 2014 and former Leadership Consultant at Sepielli Initiatives (1990–2014). His profile headline describes a neuroleadership consultant focused on leadership effectiveness and organizational transformation. The listing also shows Senior Leadership Development Consultant, & Group Lead at Microsoft - Leadership Development Group (1999–2001).
Saroj Saldanha
LinkedInExperience: Principal Consultant - Leadership Advisory and Development · Korn Ferry
Former Principal Consultant - Leadership Advisory and Development at Korn Ferry (2015–2020) and Founder & Director of Adeptus Talent since 2020. Her profile headline describes building high-performing executive teams and succession-ready leadership benches as a C-suite executive coach. She was also Director at People Business Consulting (2008–2014).
Choose the right perspective
Match the consultant's focus to your need, whether that is one-to-one executive coaching, senior team effectiveness, succession planning or a leadership development program. Ask how they measure progress and how they would work alongside your HR team.
Questions to take into the conversation
- 01How would you assess whether our senior team has the leadership capability for the next stage of the business?
- 02What makes a leadership development program change behavior rather than just deliver training?
- 03How should we plan CEO and executive succession, and when should that work start?
About this directory
This is a professional research starting point based on business profile data retrieved on . Titles and companies reflect that source snapshot and may describe past or present roles. Check the linked profiles for current details. Inclusion does not imply Instant Expert membership or availability.
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