Gregg Siefert
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Gregg Siefert Email & Phone Number

Certified Leadership Coach at Riverside Leadership
Location: New York City Metropolitan Area, United States 7 work roles 4 schools
1 work email found @shionogi-usa.com 4 phones found area 856, 973, and 800 LinkedIn matched
✓ Verified July 2026 4 data sources Profile completeness 100%

Contact Signals · 1 work email · 4 phones

Work email g****@shionogi-usa.com
Direct phone (856) ***-****
LinkedIn Profile matched
3 free lookups remaining · No credit card
Current company
Riverside Leadership
Role
Certified Leadership Coach
Location
New York City Metropolitan Area, United States

Who is Gregg Siefert? Overview

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Quick answer

Gregg Siefert is listed as Certified Leadership Coach at Riverside Leadership, based in New York City Metropolitan Area, United States. AeroLeads shows a work email signal at shionogi-usa.com, phone signal with area code 856, 973, 800, and a matched LinkedIn profile for Gregg Siefert.

Gregg Siefert previously worked as Leadership & Management Coach at Riverside Leadership and Senior Director Human Resources at Immunomedics. Gregg Siefert holds Executive Leadership Coaching Certificate from Georgetown University School Of Continuing Studies.

Company email context

Email format at Riverside Leadership

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{first_initial}{last}@shionogi-usa.com
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AeroLeads found 1 current-domain work email signal for Gregg Siefert. Compare company email patterns before reaching out.

Profile bio

About Gregg Siefert

Results oriented Executive and Leadership Coach experienced at partnering with management teams. Broad industry exposure includes: pharmaceutical, biotech, medical device, financial services and manufacturing. Demonstrated ability to work strategically with leadership teams and manage the details. Specialties: • Start-up/entrepreneurial, PE and mid-size companies• HR Strategy Development, Implementation, Effective Communication • Change Management, Employee Engagement & Leadership Coaching• Performance Management Systems Aligned with Corporate Objectives• Talent Acquisition Strategies with Cost Effective Results• Design & Rollout of Compensation & Benefit Programs in Public and Private Companies

Listed skills include Human Resources, Employee Relations, Workforce Planning, Leadership, and 46 others.

Current workplace

Gregg Siefert's current company

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Riverside Leadership
Riverside Leadership
Certified Leadership Coach
New Jersey, United States
7 roles · 28 years

Gregg Siefert work experience

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Role listed

Riverside Leadership

New Jersey, United States

Leadership & Management Coach

Current
Riverside Leadership

As your leadership coach, I will partner with you in strengthening your leadership and/or management capabilities that support effective relationships, achievement of business objectives and career growth.

2021 - Present ~5 yrs 6 mos

Senior Director Human Resources

Morris Plains, New Jersey, Us

Oncology focused public biotech - 400 employees - late stage clinical development – early commercialization (acquired by Gilead Sciences) • HR Business Partner supporting R&D and G&A executive leadership and management teams. • Designed communication training program for company management.

2018 - 2021 ~3 yrs

Vice President, Human Resources

Wedgewood

Wedgewood is the largest animal-health compounding pharmacy in the U.S. They received the 2017 annual Award for Excellence from the New Jersey Business & Industry Association (NJBIA). The award was given in the Outstanding Employer Category to recognize the company’s creative and forward-looking approach to managing its workforce. In 2015, Wedgewood Pharmacy received NJBIA’s Award for Exceptional Business Growth.Developed and implemented multi-level leadership development program in collaboration with leadership team and partnership with human capital consultant. Initiated “Success Profiles” to attract and retain staff for key positions resulting in 25% reduction in employee turnover. Led change management for multiple business process improvements using Prosci’s ADKAR change model resulting in less resistance to change and smoother adoption of new business processes. Increased employee engagement score by 10% through coaching of managers coupled with communication and employee involvement initiatives.

2012 - 2018 ~6 yrs

Executive Vice President Human Resources

Florham Park, New Jersey, Us

Partnered with CEO to build 20 person clinically focused US pharmaceutical subsidiary into 500 employee commercial operation. Growth occurred organically and through acquisition. Member of Executive Committee. Supported commercial, development and corporate functions. Collaborated with leadership team to integrate NJ and GA operations, relocate staff and open new facility. Led negotiation for and renovation of new 60,000 SF site; won approval for NJ State business incentive grant with projected value of $1.8MM. Developed cash based long term incentive program aligned with corporate financial objectives. Orchestrated realignment of clinical development and project management roles.

2008 - 2011 ~3 yrs

Vice President Human Resources

Us

Reported to CEO of public oncology focused bio-tech company involved in late stage clinical development and early commercialization. Led headcount growth from 13 to 200+ employees. Developed and implemented performance management process and recognition programs. Designed compensation & benefit programs; led Board compensation committee meetings; integrated lab acquisition; Following non-approval of New Drug Applications, led multiple workforce reductions without any subsequent legal action; and implemented novel cash based long term incentive program to retain staff during period of business uncertainty. General management experience included: acting head of legal function; oversight of building lease negotiations; and membership on acquisition due diligence team.

2000 - 2008 ~8 yrs

Vice President, Staffing

New York, Ny, Us

1999 - 2000 ~1 yr
4 education records

Gregg Siefert education

Executive Leadership Coaching Certificate

Georgetown University School Of Continuing Studies

Executive Challenge Course

Gap International

Master'S Degree, Industrial Organizational Psychology

New York University

Ba, Liberal Arts Program: Major: Psychology

Gettysburg College
FAQ

Frequently asked questions about Gregg Siefert

Quick answers generated from the profile data available on this page.

What company does Gregg Siefert work for?

Gregg Siefert works for Riverside Leadership.

What is Gregg Siefert's role at Riverside Leadership?

Gregg Siefert is listed as Certified Leadership Coach at Riverside Leadership.

What is Gregg Siefert's email address?

AeroLeads has found 1 work email signal at @shionogi-usa.com for Gregg Siefert at Riverside Leadership.

What is Gregg Siefert's phone number?

AeroLeads has found 4 phone signal(s) with area code 856, 973, 800 for Gregg Siefert at Riverside Leadership.

Where is Gregg Siefert based?

Gregg Siefert is based in New York City Metropolitan Area, United States while working with Riverside Leadership.

What companies has Gregg Siefert worked for?

Gregg Siefert has worked for Riverside Leadership, Immunomedics, Wedgewood, Shionogi Inc., and Genta Incorporated.

How can I contact Gregg Siefert?

You can use AeroLeads to view verified contact signals for Gregg Siefert at Riverside Leadership, including work email, phone, and LinkedIn data when available.

What schools did Gregg Siefert attend?

Gregg Siefert holds Executive Leadership Coaching Certificate from Georgetown University School Of Continuing Studies.

What skills is Gregg Siefert known for?

Gregg Siefert is listed with skills including Human Resources, Employee Relations, Workforce Planning, Leadership, Management, Change Management, Strategy, and Recruiting.

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