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NOTE: Information shown below has been voluntarily submitted by individuals interested in establishing mutually desired contact between half-siblings and/or donors (genetic relatives).

Disclaimer: This registry is intended strictly for informational purposes, and is neither endorsed nor supported by any individual or organization. Please note that while access to this list is restricted to individuals over 18 years of age, it is up to each and every parent to supervise and monitor their child's use of the Internet.

Posted by Parent
Posted by Sperm Donor
Posted by Egg Donor
Posted By Offspring (Male)
Posted by Offspring (Female)
Posted by Offspring (No Gender Specified)
Has Medical Info
Has Photos
Donor Q&A
Donor Match
Sibling Match

Dr. Nachtigall, Robert

Doctors Office


Donor ID & Info Offspring / Contact Info
Donor ID: unknown
  • Female born Jan 13 1988
  • Male born Apr 30 1990
  • Read message posted 12/16/05
  • Updated on 04/19/06
  • parent
Donor ID: unknown
  • Started donating Feb 1988.
  • Northern European.
  • Height: 6'3".
  • Blood type O+
  • Light brown hair.
  • Hazel eyes.
  • Fair complexion.
  • UCSF Surgical Resident.
  • Doctor- Surgeon.
  • Female born Oct 13 1989
  • Read message posted 01/11/06
  • Updated on 09/03/08
  • parent
Donor ID: unknown
  • European.
  • Height: 6'4".
  • Dark brown hair.
  • Female born Nov 1984
  • Read message posted 02/26/06
  • Updated on 09/03/08
  • parent
Donor ID: unknown
  • Height: 5' 9".
  • Blonde Curly hair.
  • Blue eyes.
  • Medical student at UCSF.
  • Physcician.
  • Had a well-known muscician ancestor from Eastern Europe.
  • Male born Apr 4 1984
  • Read message posted 03/21/06
  • Updated on 04/19/06
  • parent
Donor ID: unknown
  • Started donating 1984.
  • Stopped donating 1987.
  • European descent.
  • Blonde hair.
  • Blue eyes.
  • Fair complexion.
  • Medical student atUCSF.
  • Male born Jul 25 1985
  • Female born Jun 6 1988
  • Read message posted 03/27/06
  • Updated on 09/03/08
  • parent
Donor ID: unknown
  • Eastern European descent, Jewish.
  • Height: Tall.
  • Brown hair.
  • Blue eyes.
  • 3rd or 4th year medical student in December of 1984 when he donated.
  • Medical student at time of donation.
  • Jewish.
  • Music.
  • Described himself as being musical and funny.
  • I am a Female born Sep 9 1985
  • Read message posted 04/26/06
  • Updated on 02/06/19
  • donor_offspring Has Photos
Donor ID: unknown
  • Born Apr 22 1949.
  • Started donating Oct 19 1988.
  • Stopped donating Oct 19 1988.
  • White; American citizen; my genetics are almost half Swedish; some Scotch-Irish; some English; a bit of German; a small touch of Dutch.
  • Height: 6 feet, 3 inches.
  • Blood type A+
  • Weight: 160 pounds.
  • Dark brown Wavy hair.
  • Blue eyes.
  • Olive complexion.
  • Master's degree in zoology, University of California at Berkeley.
  • Evolutionary Biologist (reseacher); teacher; environmental leader.
  • Other.
  • Science, evoultion, nature, animals, philosophical implications of science, hiking, guitar, 1950's ad 1960's rock and roll music.
  • Office assistant was Tina. I only supplied one semen sample for Dr. Nachtigall. It was fresh, not frozen. I had dark brown hair when I supplied this semen sample; my hair is mostly gray now.
    Sperm Donor
  • Read message posted 04/07/07
  • Updated on 09/03/08
  • sperm_donor
Donor ID: unknown
  • I am a Female born Sep 1985
  • Read message posted 05/28/07
  • Updated on 09/03/08
  • donor_offspring
Donor ID: unknown
  • Donor was a student at UCSF. I'm guessing mid 1970's-early 1980's. Vague but that's all I have.
  • I am a Female born Feb 11 1983
  • Read message posted 07/15/08
  • Updated on 03/14/11
  • donor_offspring
Donor ID: unknown
  • Started donating Feb 1989.
  • Stopped donating Dec 1990.
  • Height: 6'+.
  • Brown Wavy hair.
  • Hazel eyes.
  • Fair complexion.
  • Medical Student or Resident at UCSF.
  • Jewish.
  • Good athlete.
  • Good looking! Just married at the time of the first donation
  • Female born Nov 1989
  • Female born Aug 1990
  • Read message posted 02/22/11
  • Updated on 03/28/11
  • parent
Donor ID: unknown
  • Northern European.
  • Height: 5' 10" or so.
  • Weight: 170 (?).
  • Brown hair.
  • Fair complexion.
  • Was medical school student.
  • Doctor.
  • I know so little about the donor. The sperm was live, and we were told he was of Northern European background, had my husband's coloring (as listed above). Possibly had curly hair--not sure. We were told he was in good health and that his medical history showed no major diseases.
  • Female born Feb 11 1993
  • Read message posted 01/01/13
  • Updated on 01/02/13
  • parent
Donor ID: unknown
  • I am a Female born Nov 1984
  • Read message posted 08/04/14
  • Updated on 08/09/14
  • donor_offspring
Donor ID: unknown
  • Height: 6 feet.
  • Green eyes.
  • Jewish.
  • Medical Student
  • I am a Female born Nov 18 1989
  • Female born Aug 9 1991
  • Posted 01/15/16
  • Updated on 01/15/16
  • donor_offspring Has Photos
Donor ID: unknown
  • Fair complexion.
  • Resident, Doctor .
  • Jewish.
  • I am a Child
  • Read message posted 01/22/16
  • Updated on 01/22/16
  • donor_offspring Has Photos
Donor ID: unknown
  • I am a Female born Dec 13 1996
  • Read message posted 10/23/18
  • Updated on 10/23/18
  • donor_offspring
Donor ID: unknown
  • I am a Child
  • Posted 10/18/21
  • Updated on 10/18/21
  • donor_offspring
Donor ID: unknown
  • Russian, Austrian (grandparents).
  • Height: 6'1".
  • Blood type A+
  • Weight: 165 lbs.
  • Brown Wavy hair.
  • Hazel eyes.
  • Music, History, Science, skiing.
  • I am a Child
  • Read message posted 06/18/23
  • Updated on 06/18/23
  • donor_offspring
Donor ID: NACH. MATCH#1
  • Caucasian, European.
  • Height: 6'1"+.
  • Weight: Slim/athletic.
  • Blonde hair.
  • Blue eyes.
  • Fair complexion.
  • MD.
  • Doctor or medical student.
  • Athlete or runner.
  • I was told that my donor is tall, slim/athletic, fair skinned, blonde, blue eyes, and a doctor and friend of the doctor who ran the clinic. My mother said that he was an athlete (I believe a runner) and was married and his wife was pregnant with a girl as of May 1986.
  • I am a Female born May 6 1986
  • Read message posted 11/17/15
  • Updated on 11/17/15
  • donor_offspring Post Medical Update
  • European, Irish, English, French.
  • Height: around 6'1".
  • Blue eyes.
  • Med Student.
  • Running, Rock Climbing.
  • I am a Male born Dec 5 1985
  • Read message posted 08/14/15
  • Updated on 04/26/16
  • donor_offspring Has Photos
  • Started donating May 1985.
  • Stopped donating Jul 1985.
  • Caucasian.
  • Fair complexion.
  • Graduate degree.
  • Medical student/physician.
  • European descent. Told he was married or married shortly thereafter and now has children of his own.
  • I am a Female born Apr 25 1986
  • Read message posted 01/10/15
  • Updated on 05/07/15
  • donor_offspring Post Medical Update Has Photos
  • Caucasian.
  • Height: 6'2".
  • Blood type O-
  • Blonde hair.
  • Blue eyes.
  • Possibly UCSF Medical student.
  • Running, bike-riding, and reading.
  • French and English ancestry.
  • I am a Female born Jul 1987
  • Read message posted 12/26/13
  • Updated on 04/03/14
  • donor_offspring
  • Started donating 1981.
  • Height: 6'2".
  • Weight: 175.
  • Blonde hair.
  • Blue eyes.
  • Health Sciences Graduate Student.
  • I am a Female born Feb 21 1983
  • Read message posted 09/30/13
  • Updated on 11/30/15
  • donor_offspring
  • English / French.
  • Height: 6'2".
  • Blonde hair.
  • Blue eyes.
  • Fair complexion.
  • UCSF.
  • Handsome Athletic Smart Nice guy
  • I am a Male born Sep 25 1987
  • Female
  • Read message posted 06/25/12
  • Updated on 05/07/15
  • donor_offspring Has Photos
  • Causcasian; English and French.
  • Height: over 6'.
  • Blonde hair.
  • Blue eyes.
  • Medical student at time of donation. Athletic.
  • I am a Male born Jan 1 1989
  • Read message posted 01/07/11
  • Updated on 09/07/11
  • donor_offspring Has Photos
  • White.
  • Height: 6' 2-3".
  • Weight: unknown.
  • Blonde Wavy hair.
  • Blue eyes.
  • Medical student at UCSF.
  • Physcician.
  • Sports.
  • Of French & English descent
  • Female born Oct 2 1988
  • Child
  • Read message posted 03/21/06
  • Updated on 12/26/13
  • parent
Donor ID: UNK DONOR # MATCH (1)
  • Born Feb 12 1945.
  • Started donating 1979.
  • Stopped donating 1980.
  • English, German.
  • Height: 5'8".
  • Blood type A+
  • Weight: 185.
  • Brown Wavy hair.
  • Blue eyes.
  • Medium complexion.
  • MA in Sec. Education.
  • Tech writer.
  • Protestant.
  • Travel, photography, biking, desktop publishing.
    Sperm Donor
  • Read message posted 06/09/06
  • Updated on 07/16/08
  • sperm_donor
Donor ID: 6
  • Stopped donating 1993.
  • Caucasian English French.
  • Height: 6'2".
  • Blood type O-
  • Light brown hair.
  • Blue eyes.
  • MD.
  • Doctor.
  • Running, reading, bicycling.
  • Male born Dec 7 1993
  • Male born May 19 1996
  • Posted 04/01/14
  • Updated on 04/01/14
  • parent
Donor ID: 12
  • Irish German English.
  • Height: 5'9" plus.
  • Blood type A-
  • Weight: medium build.
  • Brown hair.
  • Brown eyes.
  • Fair complexion.
  • Medical student at UCSF.
  • Doctor to be.
  • No religion.
  • Guitar running.
  • Male born Feb 18 1992
  • Read message posted 01/08/22
  • Updated on 02/23/22
  • parent
Donor ID: 26
  • Started donating 1981.
  • Austrian.
  • Height: 6'00".
  • Weight: 170.
  • Blonde Straight hair.
  • Blue eyes.
  • Fair complexion.
  • UCSF Medical student.
  • Guitar, reading, piano.
  • Hobbies were guitar, reading and piano.
  • I am a Male born Oct 4 1982
  • Read message posted 01/31/17
  • Updated on 02/03/17
  • donor_offspring Has Photos
Donor ID: 32
  • Norwegian/English.
  • Height: 6' 2".
  • Blood type B+
  • Weight: 185.
  • Brown Curly hair.
  • Hazel eyes.
  • Fair complexion.
  • UCSF Medical School.
  • Doctor.
  • Reading, guitar, writing, sports.
  • Male born Aug 20 1998
  • Read message posted 05/17/12
  • Updated on 05/17/12
  • parent
Donor ID: 36
  • Started donating 1993.
  • Stopped donating 1995.
  • Sicilian, Irish, English.
  • Height: 6' 4".
  • Weight: 190.
  • Brown Straight hair.
  • Green eyes.
  • Olive complexion.
  • UCSF.
  • Doctor.
  • Catholic.
  • Running, music, cooking.
  • Sicilian, English, Irish Student at UCSF around 1993/1994? Not sure when he stopped donating
  • Female born Aug 15 1994
  • Male born Feb 21 1996
  • Read message posted 12/13/05
  • Updated on 10/27/17
  • parent
Donor ID: 38
  • Started donating 1992.
  • Stopped donating 1994.
  • Irish, danish, lithuanian.
  • Height: 6'2".
  • Weight: 170#.
  • Brown Straight hair.
  • Brown eyes.
  • Fair complexion.
  • Law school.
  • Lawyer.
  • Protestant.
  • Saxaphone, sports, reading, jazz.
  • I am a Female born Jan 11 1995
  • Read message posted 09/10/09
  • Updated on 03/07/10
  • donor_offspring
  • Irish,Lithuanian,Danish.
  • Height: 6"2.
  • Blood type B-
  • Weight: 170lbs.
  • Brown Straight hair.
  • Brown eyes.
  • Fair complexion.
  • Lawyer.
  • Protestant.
  • Saxaphone,Sports,Reading,Jazz.
  • Male born Jul 1996
  • Posted 06/14/09
  • Updated on 06/14/09
  • parent
  • Started donating 1992.
  • Stopped donating 1994.
  • Dutch.
  • Height: 6 '2".
  • Weight: 170.
  • Brown hair.
  • Brown eyes.
  • Law student.
  • Law.
  • Skiing,plays saxaphone.
  • Male born Nov 1994
  • Male born May 1998
  • Read message posted 03/15/06
  • Updated on 09/02/08
  • parent
Donor ID: 40
  • Swiss .
  • Height: 5'10''.
  • Blood type A+
  • Weight: 175lbs.
  • Blonde hair.
  • Blue eyes.
  • Fair complexion.
  • Medical School.
  • Medical Student at UCSF.
  • Protestant.
  • Hiking, skiing, music, outdoor sports.
  • I am a Female born Mar 29 1995
  • Read message posted 09/04/17
  • Updated on 09/06/17
  • donor_offspring
Donor ID: 41
  • Born Jun 28 1961.
  • Started donating Jan 1 1994.
  • Stopped donating Dec 31 1996.
  • Polish/Slovak.
  • Height: 6'1".
  • Blood type B-
  • Weight: 190.
  • Light brown Straight hair.
  • Blue eyes.
  • Medium complexion.
  • MD.
  • Psychiatrist.
  • Agnostic.
  • Classical/jazz music, cooking, baseball.
  • I donated while I was a medical student at UCSF and was asked to donate many times over two years. I am a known donor and open to meeting any offspring that come forward and their families. I still live and practice psychiatry in the Bay Area.
    Sperm Donor
  • Male born Feb 20 1995
  • Female born Jun 6 1995
  • Posted 02/23/15
  • Updated on 02/24/15
  • sperm_donor
  • I am a Male
  • Posted 10/05/13
  • Updated on 10/05/13
  • donor_offspring
  • Started donating 1994.
  • Stopped donating 1996.
  • Height: 6'2".
  • Blood type B-
  • Weight: 190.
  • Brown Straight hair.
  • Green eyes.
  • Olive complexion.
  • Medical Student.
  • Doctor.
  • Music, running, languages.
  • Our donor was a medical student at UCSF. I concieved at the SF Center for Reproductive Medicine under Dr. Nachtigall. Our donor was of central or eastern european background and is now a doctor.
  • Female born Jun 6 1995
  • Read message posted 03/19/06
  • Updated on 09/02/08
  • parent
Donor ID: 54
  • Born Aug 18 1965.
  • Started donating Aug 1 1995.
  • Stopped donating May 1 1996.
  • Caucasian.
  • Height: 5'10".
  • Blood type O+
  • Weight: 165 pounds.
  • Brown Wavy hair.
  • Blue eyes.
  • Fair complexion.
  • B.S. in Engineering, M.S. in Engineering, Ph.D. in Engineering, M.D. (UCSF).
  • Medical Doctor, Electrical Engineer.
  • Protestant.
  • Computers, hiking, traveling, volleyball.
  • I donated only a few times in 1995-1996. I was a medical student at UCSF at the time.
    Sperm Donor
  • Read message posted 02/19/07
  • Updated on 10/02/08
  • sperm_donor Has Donor Survey
There are a total of 46 offspring, 17 sibling matches, and 3 donor to offspring matches from this Clinic.