Mary F. Tack, M.A., SHRM-SCP, HCS, SWP, SPHR

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  • Project and Budget Management
  • ​Process Improvement & Management
  • Training and Development
  • Workforce Planning and Talent Management
  • Root Cause Analysis
  • Organization and Functional Analysis
  • Lean Six Sigma and Six Sigma  Methods

Marie Leiter​,  MS, PHR,

Karen Stacy, EdD-ABD

Mary F. Tack is a talent management and organization development consultant with over 20 years of experience. She has spent most of her career in the high technology arena having worked for organizations to include L-3 National Security Solutions, Deltek and Software AG.

She consults with organizations to analyze integrated organizational human resources practices related to people, processes and technology that attract, develop, motivate, and retain productive, engaged employees. She facilitates the assessment of leaders, manager and teams and creates interventions that improve emotional intelligence, collaboration, and communication.

Key competency areas include:

Leadership, Management and Team Assessment and development: Creating and delivering soft skills training in topics to include emotional intelligence, personality styles, leadership and management best practices, and team development. Administration of Everything DiSC® 360, Management, and Team assessments.

Strategy Development: Developing Human Resources strategy to align with business objectives and culture to drive organizational development.

Organizational Development: Preparing workforce for major change initiatives and developing multiple mechanisms for changing behavior and improving organizational effectiveness.

Competency Models: Identifying measurable behaviors, characteristics, abilities and personality traits that identify successful employees across all talent management processes and programs.

Behavioral Interviewing: Applying competency-based interviewing and interviewing processes to successfully attract and hire key talent for current and future organizational needs.

Onboarding and New Hire Orientation: Acclimating new hires and ensuring that they quickly feel welcomed and valued by the organization.

Leader Assimilation: Facilitating the alignment of leader and team expectations and preferences to set the stage for a successful transition.  

Performance Management: Communicating and clarifying job responsibilities, priorities, performance goals, and measures of success to optimize employee performance.

Career Development: Designing appropriate career development models and creating assessment tools for employees to attain specific career goals.

Succession Management: Identifying and developing internal personnel with the potential to fill key or critical organizational positions.

Offsite Facilitation: Facilitating corporate offsite sessions to include agenda development, content recommendations and implementation of suitable initiatives.

Mary received her M.A. in Psychology from Marymount University and holds the following certifications and certificates:   

SPHR Senior Professional Human Resources/SHRM-SCP
Human Capital Strategist (HCS) 
Strategic Workforce Planner (SWP)

Achieve Global Certification, Achieving Results Through Genuine Leadership and Achieving Stellar Service
Certification in Behavioral Interviewing, Global Novations (now Korn Ferry)
Graduate Certificate in Instructional Design, Marymount University
Qualified to administer Everything DiSC® products, MBTI, CPI, and SkilAnalyzer
Certificate, Becoming a Leader, Jack Welch Management Institute, Strayer University


The Arc Human Capital vision is to field a passionate group of talented associates who will make such a strong positive impact on our clients with every interaction, that we become the only-choice-consultant for all of their human capital needs.

Marie Leiter is well known in the industry for providing clients with innovative, cost-effective solutions for their challenging business needs. With more than 14 years’ experience in increasingly responsible Human Resources Management positions, she offers a wealth of knowledge across the entire Human Resources spectrum: advisor, recruiting, employee relations, benefits/compensation, compliance (government contractor), performance management, training and policy development. Her ability to influence others by example, manage issues, and lead people is evident through her significant work experience and professional accomplishments.

Prior to becoming a consultant, Marie worked for Terma North America as Manager of Human Resources, the Center for Naval Analysis as Senior Manager of Employment and Employee Relations, and LEVICK Strategic Communications as Manager of Human Resources.

Additionally, Marie served as Director of Human Resources for Allied Technology Group (ATG), an $80M government contractor with 459 employees in Rockville, Maryland. At ATG, Marie established a Human Resources department to align infrastructure support to the growing business, centralized recruitment, managed a compensation plan design, implemented a HRIS for the organization, and led a five-person team. She also instituted policies and processes to maximize departmental and organization-wide efficiencies and to mitigate organization liability.

Marie received a Master of Science (MS) degree in Organizational Dynamics from the University of Pennsylvania, a Professional Human Resources (PHR) Management Certificate from Villanova University, and a Bachelor of Arts degree in Business Communication from Rosemont College.

Human capital gets you to the peak of your arc.

We keep you there.

Karen has worked with government, industry and nonprofit clients to improve business performance through organizational development diagnosis, prioritization and implementation, planning and implementation of change and process improvements, reengineering, benchmarking and best practice applications, and change management.  She has diverse line, staff, leadership and strategic senior-level experiences in multiple organizations, agencies and industries, including Fortune 25 and 100 companies. Karen has initiated direct applications and practices that are strategically aligned, stakeholder-focused and cost effective.  As an adjunct professor at The Catholic University of America for graduate level courses Karen is well qualified to inform and educate clients on different manners in which their challenges can be approached.  In addition to teaching, Karen is a speaker and presenter at national association meetings and is a certified Herrmann Brain Dominance (HBDI)® Practitioner. 

Karen’s Areas of Specialty:

  • Organizational Assessment & Development
  • Succession Planning
  • Change Management
  • Best Practices and Benchmarking
  • Requirements/Needs/Gap Analysis
  • Retention and Performance Management​
  • Business Process Documentation and BPR

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