Albers School of Business and Economics
Accounting Mentor Program

Accounting Mentors

Access the Mentor List in Excel to sort mentors by industry or company 
(updated every Friday until the Mentor Fair).

Linda Diefendorf

Company Description

Costco Wholesale Corporation operates an international chain of membership warehouses, mainly under the "Costco Wholesale" name, that carry quality, brand name merchandise at substantially lower prices than are typically found at conventional wholesale or retail sources. The warehouses are designed to help small-to-medium-sized businesses reduce costs in purchasing for resale and for everyday business use. Individuals may also purchase for their personal needs. Costco's warehouses present one of the largest and most exclusive product category selections to be found under a single roof. Categories include groceries, candy, appliances, television and media, automotive supplies, tires, toys, hardware, sporting goods, jewelry, watches, cameras, books, housewares, apparel, health and beauty aids, tobacco, furniture, office supplies and office equipment. Costco is known for carrying top quality national and regional brands, with 100% satisfaction guaranteed, at prices consistently below traditional wholesale or retail outlets.

Job Description

Responsible for ERP security relative to best practices and the mandates and regulatory requirements (PCI, SOX, HIPAA, et cetera ) to which Costco is subject.

Employment History

Started my IT audit career at Washington Mutual and then joined KPMG's information risk management group performing external & internal audits, and other types of engagements. Along the way to my current position at Costco as a Compliance Analyst, I've worked for an insurance, medical device, and hotel company as an IT audit or compliance professional.


Received my BA Business Administration, majoring in Accounting and ECIS, from Seattle University in 2003. Currently hold CISA, CRISC, Security +, and ITIL Foundation certifications.

When and where do you hold meetings with your students?

Prefer to meet up during lunch or early evening on weekdays either in the Bellevue or Issaquah area near Costco campus.