Personal Background

Born

11. January 1968

Living in

Berlin, Germany

Birthplace

Kiel, Germany

Family

married

Parents

Klaus Köhntopp, Pensioner, formerly civil servant at the Ministry of the Interior of the Land Schleswig-Holstein;

Gisela Liegmann, formerly Teacher for Word Processing at the DAA, Kiel

Interests

Project Management; Consulting; Teaching; Troubleshooting; Systems and Network Security; Application Development; Large-Scale System-Administration

Platforms

Unix on SunOS and Solaris up to Solaris 9 (Sun Workgroup and Enterprise Certifications), Linux (SuSE, RedHat, Debian, Slackware and SLS), BSD.

Also familiar with HP/UX, AIX, DEC OSF, Nextstep, and a few other platforms.

Familiar with Windows up to Windows 2000/XP.

Programming Languages

C/C++ (including Qt/moc), PHP, Perl, Pascal, Java, various assembly languages , Lisp. Also fluent in SQL and in XML/XSLT-techniques.

Also familiar with Pike, various shell scripting languages, various BASIC dialects.

Protocols and Technologies

Mail Protocols (IMAP, POP, SMTP/LMTP), Spam Control Strategies, LDAP, XML/XSLT technologies, Web scripting languages, Application Servers, Firewalls and Network Security, Intrusion Detection, Cryptographic Techniques, Cross Platform Development, Packaging and Deployment Technologies, Software Distribution.

Other

Languages: Deutsch (Muttersprache), English (Fluent), Latin; Driving License Class 3

since June 2008

Joined Booking.COM to work as a database administrator and architect.

December 2005-May 2008

Working for MySQL AB to work as a database consultant in the EMEA area.

December 2003-December 2005

Working for web.de AG in Karlsruhe, Germany, as a Senior Security Engineer. Responsible for the complete IT-Security of 23 million customers.

since 2001

Change from Web Application Development to Consulting divison inside NetUSE, doing mostly large scale mail systems and spam control

since January 1999

NetUSE GmBH buys back SH Online Dienst GmbH, SH Online becomes the Web Application Division of NetUSE.

since February 1998

Working at SH Online Dienst GmbH, developing Internet Shopping Applications and Intranet Solutions.

August 1997-January 1998

Working at the Landesbank Schleswig-Holstein, but terminated relationship due to my request as I wished to return to a more development-oriented environment.

August 1994-August 1997

Consultant for NetUSE, Kiel: Unix and Internet Consulting, Firewalls and Network Security, Tiger Teaming

May 1994-End 1995

Working as system administrator for DEC Alpha/OSF-1 at the Projektzentrum Ökosystemforschung, Kiel University

August 1991 to August 1995

Teaching „Unix System Administration“, „Unix Networking“, „Network Programming“, „System Architecture and Microprocessors“, „Programming in C“ and „Programming in Pascal“ at afbb, Kiel

Mid-1991 to End-1991

Programming and consulting (TCP/IP and Internet) for Elaplan, Schönberg

Mid-1990 to Mid-1991

Device driver and realtime programming (PDOS, 680x0 Assembler) for caitec, Hamburg

Mid-1989 to Mid-1990

Application programming (MS-DOS, C) for Ortim, Holtsee

November 2002

PHP Conference 2002, XML Transformer

Mid-2001

Member of the conference chair board for the second PHP conference.

during 2001

Member of the board of review for the Human Centered Interfaces professorship at the new MultiMedia Campus Kiel.

October 2000

PHP Conference 2000, Lecture on Webserver Security

January 2000

de.comp.lang.php is founded. I was the proponent for the newsgroup. Maintained the FAQ for the newsgroup for a year.

during 1999

Working on the study „Jugendschutz und Filtertechnologien“ im Internet for the BMWI (ministry of economics) as technical advisor in a project team around Dirk Fox, Secorvo.

May 1997

„Sperrungen im Internet“, A systematical approach to managing harmful content on Internet by blocking; for the BMBF

1990-1993

„Frequently Asked Questions“ for the Newsgroups „z-netz.telecom.modem.*“

since 1992

Articles about Unix, Internetworking, Network Security in computer magazines and books

Mid-1992

Founding member of „Individual Network e.V.“ as a nationwide umbrella for local freenet providers such as Toppoint. On the board until 1993.

since September 1987

Founding member of & working with Toppoint Mailbox e.V., a non-profit organisation providing USENET and Internet Access for Kiel

October 1986

First publication: „Speech Basic“ for the Commodore 64; won „Application of the Month“ in 64er Magazine; Markt&Technik; München

Mid-1984

Lead Special Interest Group „Computers“ at Max-Planck-Schule, Kiel

1987-1988

Bundeswehr, Medical Corps in Itzehoe and Neumünster

1978-1987

finished school at Max-Planck-Schule Kiel, with abitur in Physics, Chemistry, English and History

1974-1978

Primary School