AeroLeads people directory · profile
John Callahan Email & Phone Number
Sr. Director Procurement- HDD PCBA, Platform and Consumer Solutions CM and ODM Management
at
Western Digital
1 work email found
@fb.com
1 phone found area 650
LinkedIn matched
✓ Verified August 2026
4 data sources
Profile completeness 86%
Current company
Role
Sr. Director Procurement- HDD PCBA, Platform and Consumer Solutions CM and ODM Management
Location
Oceanside, California, United States
Company size
Who is John Callahan? Overview
A concise factual answer block for searchers comparing this professional profile.
Quick answer
John Callahan is listed as Sr. Director Procurement- HDD PCBA, Platform and Consumer Solutions CM and ODM Management at Western Digital, a with 22750 employees, based in Oceanside, California, United States. AeroLeads shows a work email signal at fb.com, phone signal with area code 650, and a matched LinkedIn profile for John Callahan.
John Callahan previously worked as Sr. Director Procurement- HDD PCBA, Platform and Consumer Solutions CM/ODM Management at Western Digital and Director, Global Supply Chain - System Operations at Facebook. John Callahan holds Business Administration from Columbia Southern University.
Company email context
Email format at Western Digital
This section adds company-level context without repeating John Callahan's masked contact details.
{first_initial}{last}@fb.com
86% confidence
AeroLeads found 1 current-domain work email signal for John Callahan. Compare company email patterns before reaching out.
Profile bio
About John Callahan
* Senior management experience in various supply chain and operations roles from start-ups to large-scale companies* Extensive international sourcing and contract negotiation experience * Proven ability to win customers and increase margins through supply chain strategies and solutions* Deliver process and performance improvement across internal and external operations* Successfully led ERP system implementation & upgrades* Successfully Managed multi regional organizations and cross functional teamsSpecialties: * Strategic Supply Chain Design* Global sourcing and logistics* Supplier relationship management* Commercial agreement design and contract negotiations* Cost and cost reduction management* Contract manufacturing / ODM / OEM* Organizational development and employee relationship management* Data Analytics
Current workplace
John Callahan's current company
Company context helps verify the profile and gives searchers a useful next step.
Western Digital
7 roles · 24 years
John Callahan work experience
A career timeline built from the work history available for this profile.
Sr. Director Procurement- Hdd Pcba, Platform And Consumer Solutions Cm/Odm Management
Current
Nov 2022 - Present
Director, Global Supply Chain - System Operations
Led operations teams in execution of new product introduction & development programs, as well as, supply planning, procurement and ODM/OEM partner performance management and execution to data centers and Facebook PoP (Point of Presence) locations throughout the world.
Jan 2020 - Sep 2021
Director, Sourcing Odm/Oem & Integration
Managed a team of Sourcing Managers, NPI Materials Program Managers, Materials Planning Managers and Business Systems and Process Managers responsible for all activities related to global strategy, supply chain design, contract negotiation and supplier relationship management. In addition, built and led early-stage strategic technology sourcing teams responsible for CPU, HDD, Memory, Power and Mechanical commodities.
May 2012 - Jan 2020
Director Strategic Sourcing & Operations
Greenvolts
Joined a solar system equipment company prior to first alpha systems being built and shipped under the new leadership team with less than 60 people employed at the time. Responsibilities include supply chain design, supplier selection & qualification, contract negotiations, managing supplier build plan and ship schedules, logistics, cost management, and product ramp readiness and release in a full turn-key outsourced model. Major accomplishments include qualified tier 1 supply chain for manufacturing and distribution of product, led team efforts for successful production release and ramp readiness, implemented Oracle ERP system, and built a strategic sourcing organization.
Dec 2009 - May 2012
Vice President Sourcing & Procurement
Responsible for building a strategic sourcing organization and strategy for JDSU’s Communications & Commercial Optical Products business segment (CCOP). Directing activities associated with global supply chain design, strategic direction for all commodities, contract negotiation and New Product Introduction for over $100m in annual external material spend. Other activities included leading the RFP activity and contract negotiations for the sale of JDSU’s Shenzhen factory assets and contract manufacturing services agreement.
2008 - Oct 2009
Sr. Director Supply Chain Operations
Responsible for directing activities associated with global supply chain design, strategic direction for all commodities, contract negotiation and supplier relationship management. Additional functional responsibilities include; global procurement, logistics, shipping and receiving, and stockroom. I supported 4 engineering design centers and manufacturing locations around the world (US, Mexico, Europe and China).
2003 - 2008
~5 yrs
Team & coworkers
Colleagues at Western Digital
Other employees you can reach at wdc.com. View company contacts for 22750 employees →
W(
Wiwat (Hme)
Colleague at Western DigitalBangkok City, Thailand
View →
MA
Mehr Ali
Colleague at Western DigitalFremont, California, United States
View →
SL
Ssu-Pei Lee
Colleague at Western DigitalHsinchu City, Taiwan, Province Of China
View →
CM
Chris Mchenry
Colleague at Western DigitalSan Leandro, California, United States
View →
MS
Martha Stuert
Colleague at Western DigitalPortland, Oregon, United States
View →
ST
Stevenson Tan
Colleague at Western DigitalRowland Heights, California, United States
View →
EG
Ec Goh
Colleague at Western DigitalSimpang Empat, Penang, Malaysia
View →
NS
Nor Silawati
Colleague at Western DigitalPadang Serai, Kedah, Malaysia
View →
SR
Suratda Ruang-U-Rai
Colleague at Western DigitalThailand
View →
SD
Santhosh Devadiga
Colleague at Western DigitalBengaluru, Karnataka, India
View →
Wiwat (Hme)
Colleague at Western DigitalBangkok City, Thailand
View →
MA
Mehr Ali
Colleague at Western DigitalFremont, California, United States
View →
SL
Ssu-Pei Lee
Colleague at Western DigitalHsinchu City, Taiwan, Province Of China
View →
CM
Chris Mchenry
Colleague at Western DigitalSan Leandro, California, United States
View →
MS
Martha Stuert
Colleague at Western DigitalPortland, Oregon, United States
View →
ST
Stevenson Tan
Colleague at Western DigitalRowland Heights, California, United States
View →
EG
Ec Goh
Colleague at Western DigitalSimpang Empat, Penang, Malaysia
View →
NS
Nor Silawati
Colleague at Western DigitalPadang Serai, Kedah, Malaysia
View →
SR
Suratda Ruang-U-Rai
Colleague at Western DigitalThailand
View →
SD
Santhosh Devadiga
Colleague at Western DigitalBengaluru, Karnataka, India
View →
2 education records
John Callahan education
Business Administration
Columbia Southern University
Education record
Notre Dame De Namur University
FAQ
Frequently asked questions about John Callahan
Quick answers generated from the profile data available on this page.
What company does John Callahan work for?
John Callahan works for Western Digital.
What is John Callahan's role at Western Digital?
John Callahan is listed as Sr. Director Procurement- HDD PCBA, Platform and Consumer Solutions CM and ODM Management at Western Digital.
What is John Callahan's email address?
AeroLeads has found 1 work email signal at @fb.com for John Callahan at Western Digital.
What is John Callahan's phone number?
AeroLeads has found 1 phone signal(s) with area code 650 for John Callahan at Western Digital.
Where is John Callahan based?
John Callahan is based in Oceanside, California, United States while working with Western Digital.
What companies has John Callahan worked for?
John Callahan has worked for Western Digital, Facebook, Greenvolts, Jdsu, and Radisys Corporation.
Who are John Callahan's colleagues at Western Digital?
John Callahan's colleagues at Western Digital include Wiwat (Hme), Mehr Ali, Ssu-Pei Lee, Chris Mchenry, and Martha Stuert.
How can I contact John Callahan?
You can use AeroLeads to view verified contact signals for John Callahan at Western Digital, including work email, phone, and LinkedIn data when available.
What schools did John Callahan attend?
John Callahan holds Business Administration from Columbia Southern University.
Find 750M verified contacts
Search by job title, company, industry, location, and seniority. Export verified B2B contact data when you need it.
Start free trial