Brian Rossmeisl

About Brian Rossmeisl

I am a senior cybersecurity leader with deep experience designing, operating, and…

Experience

1. Principal Cybersecurity

   AT&T

   Aug 2025 — Present

   Creating and implementing best practices for policies, rules, and signatures to mitigate threats - Integrating applications and platforms with identity providers using current IAM technologies to support SSO - Developing advanced alerts and reports tailored to the needs of key stakeholders and business units - Automating security tool management and integrating workflows for operational efficiency - Collaborating with Information Security and Engineering teams to build use cases aligned with business requirements - Designing and deploying custom alerting dashboards in SIEM for continuous monitoring and investigative support - Working closely with business units and stakeholders across the organization to configure and fine-tune proxy policies - Supporting the collection and presentation of metrics for key performance indicators (KPIs) and key risk indicators (KRIs)- Maintaining and enhancing existing monitoring capabilities and data collection systems - Leading troubleshooting efforts for complex issues involving multiple platforms and network flows - Coordinating with vendors and technical teams to resolve escalations and streamline issue resolution - Executing scaled security controls engineering and operational responsibilities - Tracking and analyzing performance metrics and KPIs to identify improvement opportunities and implement solutions that boost efficiency, security effectiveness, and ROI - Preparing and presenting regular reports to senior management, outlining program progress, challenges, and accomplishments - Managing and optimizing security operations, including monitoring, detection, and incident response, while driving continuous improvement of security processes and technologies

Skills

• Single Sign-on (Sso)
• Linux System Administration
• Internet Protocol Suite (Tcp/Ip)
• F5 Viprion
• Cisco Ios
• Pulse Secure Pulse Connect Secure
• Business Development
• Dnssec
• Amazon Web Services (Aws)
• F5 Apm
• Rancid
• Infoblox
• Python
• Fiddler
• Client-Focused
• Load Balancing
• Akamai
• Altavista Tunnel Server 97
• Ipsec
• F5 Ltm
• Checkpoint
• Cdn
• Tcl
• Web Application Security
• Pki
• Enterprise Solution Sales
• Secure Sockets Layer (Ssl)
• Pre/Post Sales Engineers
• Radius
• Cisco Asa
• Dns Administration
• Wireshark
• Professional Services
• Kerberos
• Nokia Ipso
• Tacacs+
• F5 Asm
• Identity & Access Management (Iam)
• F5 Gtm
• Ldap