Weak gravitational lensing has emerged as an important probe to test models of cosmology, galaxy physics and gravity. Stage-IV Galaxy and CMB surveys aim to measure the lensing power spectra with signal to noise ratio of few hundred.

With such high statistical precision, developing new methods to optimally extract information as well as to control systematic biases in the lensing measurements and their inference, at a level below the statistical uncertainties presents an immediate challenge to the community. This workshop aims to bring together the experts from both Galaxy lensing and CMB lensing communities to discuss several of the challenges that can limit the scientific value derived from the lensing measurements. We will also have sessions on new ideas that can increase the science output from these surveys. We hope to have a lively debate about the past and ongoing efforts in both Galaxy and CMB lensing communities and identify the paths forward.

The format of the workshop will be aimed at facilitating informal discussions. Topics will include observational systematics in galaxy lensing such as shear calibration and photometric redshifts, observational systematics in CMB lensing including CMB foregrounds and modelling uncertainties on small scales including the effects of baryonic physics and galaxy-halo connections. Please check the program for more details.

Where: UC Berkeley
Dates: January 14-16, 2019


Registration is limited to 50 participants.

Registration is closed now. Please contact the organizing committee if you would like to attend and we maybe able to accommodate in case there are cancellations.

There is no registration fee; please contact the organizing committee if you require an invitation letter for visa applications.


Talks will happen in Campbell Hall 131.

Breakfast, lunch and poster sessions will be in room 355 and BCCP commons area next to it.

The reception and dinner on Monday, January 14, will take place on the roof (6th floor) of Campbell Hall, starting at 6pm.

Code of conduct

We are committed to making the meeting productive and enjoyable for everyone, regardless of gender, sexual orientation, disability, physical appearance, body size, race, nationality or religion. We will not tolerate harassment of participants in any form. Please follow these guidelines:

Behave professionally. Harassment and sexist, racist, or exclusionary comments or jokes are not appropriate. Harassment includes sustained disruption of talks or other events, inappropriate physical contact, sexual attention or innuendo, deliberate intimidation, stalking, and photography or recording of an individual without consent. It also includes offensive comments related to gender, sexual orientation, disability, physical appearance, body size, race or religion. All communication should be appropriate for a professional audience including people of many different backgrounds. Sexual language and imagery are not appropriate. Be kind to others. Do not insult or put down other attendees. Participants asked to stop any inappropriate behavior are expected to comply immediately. Attendees violating these rules may be asked to leave the event at the sole discretion of the organizers without a refund of any charge.

Any participant who wishes to report a violation of this policy is asked to speak, in confidence, to any of the meeting organizers.


We have reserved a block of rooms in the guest house at Berkeley lab. Please follow the instructions in the folllowing document to reserve the room.

  • Berkeley lab guest house instructions
  • Hotels in downtown Berkeley are also convenient. Some recommended local hotels are:

    • The Faculty Club
      UC Berkeley campus
      Reservations: 510-540-5678, ext 0
      [email protected]
      Mention that you are attending a UCB workshop to try to get lower rates
    • Rose Garden Inn
      2740 Telegraph Avenue
      Berkeley, CA, 94705
      Reservations: 510-549-2145
      [email protected]
      Mention that you are attending a UCB workshop to try to get lower rates
    • Bancroft Hotel
      2680 Bancroft Way
      Berkeley, CA, 94704
      Reservations: 510-549-1000
      Mention that you are attending a UCB workshop to try to get lower rates
    • Hotel Shattuck Plaza
      2086 Allston Way
      Berkeley, CA 94704
      Reservations: Tel: (510) 845-7300 /[email protected]
      Please request the discounted UCB/LBNL rate. Parking lot near hotel.
    • Downtown Berkeley Inn
      2001 Bancroft Way, Berkeley, CA 94704
      Tel: 510-843-4043 Reservations: [email protected]
      To secure your reservation please call the hotel directly at 510/843-4043 and indicate you are requesting the UCB/LBNL Campus Rate. Parking lot next to the hotel.
    • Graduate Berkeley Hotel (formerly Hotel Durant)
      2600 Durant Avenue
      Berkeley, CA, 94704
      Tel: 510.845.8981
      To secure your reservation, please call the hotel directly at 800/238-7268 and indicate you are requesting the UCB/LBNL Campus Rate. Unfortunately, you cannot use the online booking feature to secure a room at the LBNL/Campus Rate so please call directly. Parking available at the hotel for a small fee.
    • SenS Hotel & Bistro (formerly French Hotel)
      1538 Shattuck Avenue
      Berkeley, CA, 94709
      Tel: 510-548-9930 / [email protected]
      Please mention UCB/LBNL to receive a discounted rate. Parking is available near the hotel. Located in Berkeley's 'Gourmet Ghetto' in a three-level brick building with a cafe on the ground floor.