Warren Zenna Warren has over 25 years of experience in the B2B sales and marketing industry as a top B2B seller, sales leader, and Executive PL buyer of B2B services. Additionally, Warren's background as a Fractional CRO and sales/marketing advisor for B2B companies has created the foundation of knowledge and experience for The CRO Collective. If you are a CEO, a CRO, or an aspiring CRO, the CRO Collective was created for you.