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    • Overview

      TCS is here to make a difference through technology.

      Leading the way in innovation for over 50 years, we build greater futures for businesses across multiple industries and 131 countries.

      Discover all solutions
    • Industries
      • Banking
      • Capital Markets
      • Consumer Goods and Distribution
      • Communications, Media, and Information Services
      • Education
      • Energy, Resources, and Utilities
      • Healthcare
      • High Tech
      • Insurance
      • Life Sciences
      • Manufacturing
      • Public Services
      • Retail
      • Travel and Logistics
    • Services
      • Cloud
      • Cognitive Business Operations
      • Consulting
      • Cybersecurity
      • Data and Analytics
      • Enterprise Solutions
      • IoT and Digital Engineering
      • Network Solutions and Services
      • TCS Interactive
      • Sustainability Services
    • Products and Platforms
      • TCS ADD™
      • TCS BANCS™
      • TCS BFSI Platforms
      • TCS CHROMA™
      • TCS Customer Intelligence & Insights™
      • TCS ERP on Cloud
      • ignio™
      • TCS iON™
      • TCS HOBS™
      • TCS Intelligent Urban Exchange™
      • TCS OmniStore™
      • TCS Optumera™
      • TCS Tap™
      • Quartz™ – The Smart Ledgers™
      • TCS TwinX™
      • TCS MasterCraft™
      • Jile™
    • Research & Innovation
      • TCS Research
      • TCS Pace™
    Overview
  • Industries
    • Banking
    • Capital Markets
    • Consumer Goods and Distribution
    • Communications, Media, and Information Services
    • Education
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    • Healthcare
    • High Tech
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  • Services
    • Cloud
    • Cognitive Business Operations
    • Consulting
    • Cybersecurity
    • Data and Analytics
    • Enterprise Solutions
    • IoT and Digital Engineering
    • Network Solutions and Services
    • TCS Interactive
    • Sustainability Services
  • Products and Platforms
    • TCS ADD™
    • TCS BANCS™
    • TCS BFSI Platforms
    • TCS CHROMA™
    • TCS Customer Intelligence & Insights™
    • TCS ERP on Cloud
    • ignio™
    • TCS iON™
    • TCS HOBS™
    • TCS Intelligent Urban Exchange™
    • TCS OmniStore™
    • TCS Optumera™
    • TCS Tap™
    • Quartz™ – The Smart Ledgers™
    • TCS TwinX™
    • TCS MasterCraft™
    • Jile™
  • Research & Innovation
    • TCS Research
    • TCS Pace™
    • Overview

      We’re in it for good, driving positive change for the benefit of all.

      Our expert, committed team put our shared beliefs into action – every day. Together, we combine innovation and collective knowledge to create the extraordinary.

      Discover the difference
    • About Us
      • Corporate Sustainability
      • Diversity, Equity, and Inclusion
      • Corporate Social Responsibility
      • The TCS Way
      • Sports Sponsorships
      • Alliances
    • Leadership
    • In the news

      Recent News

      27 Nov 2023 TCS launches new Generative AI practice in collaboration with AWS
      22 Nov 2023 TCS Ranked #1 in Spain for Customer Satisfaction in Service Delivery Among IT and Cloud Services Providers
      20 Nov 2023 ASX signs agreement with TCS to replace its cash equities clearing and settlement platform
      View All
    • Events
    Overview
  • About Us
    • Corporate Sustainability
    • Diversity, Equity, and Inclusion
    • Corporate Social Responsibility
    • The TCS Way
    • Sports Sponsorships
    • Alliances
  • Leadership
  • In the news
  • Events
    • Overview

      Extraordinary expertise leads to remarkable results.

      We share news, insights, analysis and research – tailored to your unique interests – to help you deepen your knowledge and impact.

      Discover Expert Insights
    • Customer Stories
    • Perspectives
    • Global studies
    • Topics
      • Insights
      • Metaverse
      • Sustainability
      • Cybersecurity
      • AI & ML
      • Blockchain
      • Cloud
      • Future of Work
      • Health & Wellness
      • IoT
      • Data Analytics and Storage
    Overview
  • Customer Stories
  • Perspectives
  • Global studies
  • Topics
    • Insights
    • Metaverse
    • Sustainability
    • Cybersecurity
    • AI & ML
    • Blockchain
    • Cloud
    • Future of Work
    • Health & Wellness
    • IoT
    • Data Analytics and Storage
    • Overview

      Want to be a global change-maker? Join our team.

      At TCS, we believe exceptional work begins with hiring, celebrating and nurturing the best people — from all walks of life.

      Join us
    • India
      • India
    • Americas
      • Argentina
      • Brazil
      • Canada
      • Chile
      • Colombia
      • Ecuador
      • Mexico
      • Peru
      • Uruguay
      • USA
    • Asia Pacific
      • Australia
      • Mainland China
      • Hong Kong SAR
      • Indonesia
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      • New Zealand
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    Overview
  • India
    • India
  • Americas
    • Argentina
    • Brazil
    • Canada
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    • Colombia
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    • Uruguay
    • USA
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  • Middle East and Africa
    • Bahrain
    • Israel
    • Kuwait
    • Qatar
    • Saudi Arabia
    • South Africa
    • United Arab Emirates
    • Overview

      TCS works hand in hand with world-leading investors.

      Tata Consultancy Services Limited
      NSE:TCS
      INR
      Discover more
    • Management Commentary
      • Latest Quarter Commentary
      • Annual Report Section
    • Financials
      • Quarterly Earnings Reports
      • Download TCS Data Sheet
      • Erstwhile CMC Financials
    • News and Events
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      • Subsidiaries
      • Subscribe to Investor Updates
      • Unclaimed Dividend Information
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    • Latest Quarter Commentary
    • Annual Report Section
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    • Download TCS Data Sheet
    • Erstwhile CMC Financials
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    • Environment
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    • Stakeholder Engagement and Identification of Material Issues
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    • Who We Are
    • Leadership

    Don Callahan

    Director (Independent, Non-Executive)

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    Mr. Don Callahan, holds a BA Degree from Manhattanville College. He is a transformative leader with broad experience driving strategic change across large global organizations, and dealing with multiple stakeholders in local and national governments and regulatory bodies.

    Until November 2018, Don was the Chief Administrative Officer and Head of Operations and Technology of Citigroup and a member of Citi's Operating Committee. He also held the Executive Chair of the Chief Information Officer Council, which sets global standards for all technology throughout Citi, and led the Digital Governance Office, which drives digital transformation across Citi's businesses. He has played an important role in transforming Citigroup’s Operations and Technology from a loose federation of independent and dispersed entities into a lean, globally-integrated enterprise.

    In addition to his technology responsibilities, he was also responsible for: overseeing Citi's Shared Services organization, comprising an integrated global managed services model executed through 34 Citi Service Centers; overseeing Citi's enterprise analytics platform, which transforms raw data into actionable knowledge, creating new insights and value for clients; and managing Citi's global real estate portfolio, generating increased productivity by consolidating Citi's footprint and optimizing the workplace environment.

    Prior to joining Citi in 2007, he held the position of Director of Strategy for IBM Japan. In Morgan Stanley, he initially served in numerous roles in strategy, business development, and client technology in the Equities Division and finally became the Head of Business Management for the Institutional Securities Group. He was also a part of Credit Suisse, where he developed and implemented client-centric technology strategies that drove productivity, enhanced client service and improved profitability.

    Don is actively involved in several community organizations. He is Co – Chairman of the board of Sheltered harbor, a subsidiary of the Financial Services Information Sharing and Analysis Center (FS-ISAC), Chairman of the Board of Trustees at Manhattanville College and also serves on the board of the American Red Cross in Greater New York, the New York Hall of Science. He is a member of the Gaelic-American Club in Fairfield, CT, Business Committee of Metropolitan Museum of Art and is a Fellow at the Foreign Policy Association. 

    A fourth-generation Irish American with ancestral links to County Cork, Ireland on both sides of his family, Don lives in Fairfield CT with his wife, Lisa. They have four sons.

    He is also a part of the NYC Mayor’s Carbon Challenge, a citywide leadership initiative to reduce greenhouse gas emissions by 30% in many of the largest commercial buildings in the New York city by 2027.

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