Mark Schleifer's Resume

Industry Experience:

2000-Present: VP of IP Engineering
Cogent Communications, Inc, Washington, DC.

Responsible for tactical and strategic engineering of Cogent’s IP network. Cogent’s network is made up Cisco GSR routers connected to Long Haul DWDM systems carrying multiple OC-192 Point to point circuits as well as Metro based DWDM systems carrying OC-48 and Gigabit Ethernet. Directed the IP Network Engineering group, IP Network Design and Testing Group, Internet Peering/Capacity Planning group, and Network Programming group. Involved in all aspects of company, including those outside of direct responsibility, as that is the nature of working for a startup.

1994-2000: Sr. Director, Network Engineering
DIGEX, Inc (carve out IPO from Intermedia), Beltsville, MD.

Manage Network Engineering group, Capacity Planning group and Research and Development group. Responsible for creating and installing a robust, high-availability, scalable web farm design including core, distribution, and cluster layer routers and switches and structured wiring. Manage contractors during construction of computer rooms, data closets, and intra-campus underground fiber pulls on both east and west coast projects. Coordinate peering and backbone circuit deployment to maintain network throughput and availability. Network equipment includes: Cisco routers (12012s and 7206s), Cisco Switches (6506 and 6509).

Sr. Director, IP Customer Aggregation
DIGEX, Inc and Intermedia Communications, Inc (DIGEX was acquired by Intermedia), Beltsville, MD.

Direct leased line installation/operations group, field engineering group, research and development group, and IP address allocation/DNS group. Responsible for all aspects of customer turn up and network troubleshooting, field installations, and new equipment testing. This includes upgrading national network to OC-3, OC-12, and OC-48 circuits. Integrate DIGEX’s IP leased line network and Intermedia’s IP networks. Work with Department VP and Directors to design and implement network backbone and create departmental budgets.

Director, Router Installation and Maintenance
DIGEX, Inc, Beltsville, MD.

Direct leased line installation/operations group, field engineering group, research and development group, and IP address allocation/DNS group. Responsible for all aspects of customer turn up and network troubleshooting, field installations, and new equipment testing. Deployed national network of over 50 POPs with DS-3 connectivity. Work with Department VP to design and implement network backbone and create departmental budgets.

Manager, Router Installation and Maintenance
DIGEX, Inc (formerly Digital Express Group), Beltsville, MD

Manage Leased Line Installers responsible for turn up and configuration of customer leased lines. Assist in day-to-day turn up of customer leased lines. Manage Research and Development Coordinator for leased line business unit. Manage Purchasing Coordinators for leased line business unit. Maintain ARS Server and support order entry system. Define and maintain configuration standards for both DIGEX and CPE routers. Work with director to design and implement network backbone as company grows. Troubleshoot network problems as they arise. Perform IP address allocation and work with NIC to acquire more address space when necessary.

Communications Engineer
Digital Express Group, Inc, Greenbelt, MD.

Sole person responsible for turn up and delivery of customer leased lines. Responsibilities include specifying, ordering, installing, troubleshooting, and customer service of: leased lines, equipment and software. Work with manager to design and implement network backbone as company grows. Design and implement online order entry system to replace existing paper system using Remedy's Action Request System (ARS). Integrated trouble ticket system with order entry system to track customer outages (using ARS). WAN equipment includes: Cisco routers, T1 CSU/DSU, DDS CSU/DSU, T1 Channel Banks, other routers as necessary, customer servers as necessary.

1993-1994: Systems Analyst
Kandl Data Products, Beltsville, MD.

Design and implement large scale LANs and WANs. Responsibilities include specifying, installing, and configuring, equipment and software. Troubleshooting problems and contacting vendors as necessary. Sample Projects include: customer LAN & Application integration with INTERNET services, Multiple office LAN interconnection via leased circuits, Voice system interconnection via leased circuits. LAN equipment experience includes: RS-232, Ethernet (NICs, Concentrators, Managed Hubs), NetWare Fileservers, UNIX workstations (UnixWare, SUNOS/Solaris, HP-UX). WAN equipment experience includes: Bridges, Routers, Gateways, CSU's/DSU's, T1 MUX's, T1 Encryption.

1992-1993: Member of the Technical Staff
COMSAT Laboratories, Clarksburg, Maryland.

Manage COMSAT Labs' fiber-optic backbone and all networked equipment in the Systems Development Division (SDD) of the Labs. Responsibilities include: Installing equipment and software, day-to-day maintenance, troubleshooting problems as they arise, supervise technicians. Networked SDD equipment includes Macs, PC’s, DECstations, HP/Apollos, HP 9000/300, SUN Sparc IPX, SynOptics 3000 Hub, Cisco IGS Router, HP Remote Bridges, Cabletron MMAC Hubs, UTP cable plant, QMS printers (820, 2000, ColorScript). Programming projects include developing MS-Windows applications, providing a client/server shell between VAX and DECstation using DECnet protocol, and porting C/UNIX programs between platforms.

1988-1992: Staff Programmer (Part-Time: 20 hrs/wk)
University of Maryland Institute for Advanced Computer Studies (UMIACS), College Park, Maryland.

Responsible for developing, modifying, and installing systems software on UNIX based machines. Programming done primarily in "C" with some csh scripts included. Programming experience on: SUN 3, SUN SPARCstation, DECstation 3100, VAX, Encore Multimax.

1985-1987: Data-Processing Operator I (Part-Time: 34 hr/wk)
Baltimore County Data-Processing, Towson, Maryland.

Responsible for daily operation and support of the County's IBM 3090, Emergency Services' (2) DEC PDP11/70s, and the maintenance of various telecommunication networks. IBM 3090 work included scheduling/ running of various jobs for all departments in County Government, maintenance of tape libraries, and distribution of reports. Emergency services work involved maintaining machines and peripherals used for the County's Computer Aided Dispatching system (911 call center, police, fire, and ambulance dispatch). Network experience involved trouble-shooting various terminal/printer problems on multiple leased line networks and dealing with telecom and equipment vendors.

Programming Languages/Skills: Cisco IOS, Cisco Catalyst OS, perl/awk/sed, sh/csh, lex/yacc, C, PASCAL, BASIC.

Education: University of Maryland, College Park, Maryland: B.S. in Computer Science

References: Available upon request.